{"id":22909,"date":"2025-03-11T08:55:42","date_gmt":"2025-03-11T05:55:42","guid":{"rendered":"https:\/\/www.cenuta.com\/blog\/?p=22909"},"modified":"2025-03-11T08:55:43","modified_gmt":"2025-03-11T05:55:43","slug":"captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri","status":"publish","type":"post","link":"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/","title":{"rendered":"Captcha Nedir? Bot Trafi\u011fini ve Spam\u2019\u0131 \u00d6nleme Y\u00f6ntemleri"},"content":{"rendered":"\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_71 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0130\u00e7indekiler<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a20ae528dba7\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a20ae528dba7\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/#Captcha_Nedir\" title=\"Captcha Nedir?\">Captcha Nedir?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/#Captcha_Neden_Kullanilir\" title=\"Captcha Neden Kullan\u0131l\u0131r?\">Captcha Neden Kullan\u0131l\u0131r?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/#Captcha_Turleri\" title=\"Captcha T\u00fcrleri\">Captcha T\u00fcrleri<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/#Metin_Tabanli_Captcha\" title=\"Metin Tabanl\u0131 Captcha\">Metin Tabanl\u0131 Captcha<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/#Gorsel_Resim_Tabanli_Captcha\" title=\"G\u00f6rsel (Resim Tabanl\u0131) Captcha\">G\u00f6rsel (Resim Tabanl\u0131) Captcha<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/#Matematiksel_Captcha\" title=\"Matematiksel Captcha\">Matematiksel Captcha<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/#Kaydirmali_Slider_Captcha\" title=\"Kayd\u0131rmal\u0131 (Slider) Captcha\">Kayd\u0131rmal\u0131 (Slider) Captcha<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/#reCAPTCHA\" title=\"reCAPTCHA\">reCAPTCHA<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/#Captcha_Guvenligi_ve_Asilma_Yontemleri\" title=\"Captcha G\u00fcvenli\u011fi ve A\u015f\u0131lma Y\u00f6ntemleri\">Captcha G\u00fcvenli\u011fi ve A\u015f\u0131lma Y\u00f6ntemleri<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/#Captcha_Alternatifleri\" title=\"Captcha Alternatifleri\">Captcha Alternatifleri<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/#Sonuc\" title=\"Sonu\u00e7\">Sonu\u00e7<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Captcha_Nedir\"><\/span>Captcha Nedir?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Captcha (Completely Automated Public Turing test to tell Computers and Humans Apart), insanlar\u0131 otomatik yaz\u0131l\u0131mlardan (botlardan) ay\u0131rt etmek i\u00e7in kullan\u0131lan bir g\u00fcvenlik mekanizmas\u0131d\u0131r. Genellikle web sitelerinde oturum a\u00e7ma, form doldurma, yorum yapma veya kay\u0131t olma gibi i\u015flemler s\u0131ras\u0131nda kullan\u0131c\u0131lar\u0131n ger\u00e7ek bir insan olup olmad\u0131\u011f\u0131n\u0131 do\u011frulamak i\u00e7in kullan\u0131l\u0131r.<\/p>\n\n\n\n<p>Captcha sistemleri, botlar\u0131n otomatik olarak ger\u00e7ekle\u015ftirebilece\u011fi i\u015flemleri k\u0131s\u0131tlamak ve k\u00f6t\u00fc ama\u00e7l\u0131 aktiviteleri engellemek i\u00e7in geli\u015ftirilmi\u015ftir.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Captcha_Neden_Kullanilir\"><\/span>Captcha Neden Kullan\u0131l\u0131r?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u0130nternet ortam\u0131nda k\u00f6t\u00fc ama\u00e7l\u0131 botlar, spam yorumlar b\u0131rakabilir, sahte hesaplar olu\u015fturabilir veya bir web sitesinin g\u00fcvenlik a\u00e7\u0131klar\u0131ndan faydalanarak sald\u0131r\u0131lar ger\u00e7ekle\u015ftirebilir. Captcha, a\u015fa\u011f\u0131daki durumlarda kullan\u0131larak bu t\u00fcr tehditleri engeller:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Spam Korumas\u0131<\/strong>: Blog ve forumlarda, botlar\u0131n otomatik yorumlar g\u00f6ndermesini \u00f6nler.<\/li>\n\n\n\n<li><strong>Kullan\u0131c\u0131 Do\u011frulama<\/strong>: \u00dcyelik sistemlerinde, yaln\u0131zca ger\u00e7ek kullan\u0131c\u0131lar\u0131n kay\u0131t olmas\u0131n\u0131 sa\u011flar.<\/li>\n\n\n\n<li><strong>Hizmetin K\u00f6t\u00fcye Kullan\u0131m\u0131n\u0131 \u00d6nleme<\/strong>: Bilet sat\u0131n alma, promosyonlar veya anketler gibi hizmetlerin k\u00f6t\u00fcye kullan\u0131m\u0131n\u0131 engeller.<\/li>\n\n\n\n<li><strong>DDoS ve Brute Force Sald\u0131r\u0131lar\u0131n\u0131 \u00d6nleme<\/strong>: Sunuculara yap\u0131lan a\u015f\u0131r\u0131 istekleri azaltarak, sald\u0131r\u0131lara kar\u015f\u0131 bir savunma sa\u011flar.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Captcha_Turleri\"><\/span>Captcha T\u00fcrleri<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Metin_Tabanli_Captcha\"><\/span>Metin Tabanl\u0131 Captcha<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Bu t\u00fcr Captcha\u2019larda, kullan\u0131c\u0131lara bozulmu\u015f veya kar\u0131\u015f\u0131k \u015fekilde g\u00f6sterilen harf ve rakamlar sunulur ve do\u011fru bir \u015fekilde yazmalar\u0131 beklenir.<\/p>\n\n\n\n<p><strong>Avantajlar\u0131<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Uygulamas\u0131 basittir.<\/li>\n\n\n\n<li>K\u00fc\u00e7\u00fck boyutlu bir sistemdir, sayfa y\u00fcklenme h\u0131z\u0131na fazla etki etmez.<\/li>\n<\/ul>\n\n\n\n<p><strong>Dezavantajlar\u0131<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>G\u00f6rme engelli kullan\u0131c\u0131lar i\u00e7in eri\u015filebilirlik sorunu yaratabilir.<\/li>\n\n\n\n<li>Geli\u015fmi\u015f yapay zeka sistemleri taraf\u0131ndan \u00e7\u00f6z\u00fclebilir.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Gorsel_Resim_Tabanli_Captcha\"><\/span>G\u00f6rsel (Resim Tabanl\u0131) Captcha<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Kullan\u0131c\u0131lara belirli nesneleri (\u00f6rne\u011fin trafik \u0131\u015f\u0131klar\u0131, otob\u00fcsler veya yaya ge\u00e7itleri) i\u00e7eren bir dizi resim g\u00f6sterilir ve belirli bir \u00f6\u011feyi se\u00e7meleri istenir.<\/p>\n\n\n\n<p><strong>Avantajlar\u0131<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0130nsanlar i\u00e7in genellikle daha kolayd\u0131r.<\/li>\n\n\n\n<li>Yapay zeka destekli botlar taraf\u0131ndan \u00e7\u00f6z\u00fclmesi zor olabilir.<\/li>\n<\/ul>\n\n\n\n<p><strong>Dezavantajlar\u0131<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>G\u00f6rme engelli ki\u015filer i\u00e7in eri\u015filebilir de\u011fildir.<\/li>\n\n\n\n<li>Mobil cihazlarda kullan\u0131c\u0131 deneyimi a\u00e7\u0131s\u0131ndan zorlay\u0131c\u0131 olabilir.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Matematiksel_Captcha\"><\/span>Matematiksel Captcha<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Kullan\u0131c\u0131lardan basit bir matematik i\u015flemini (\u00f6rne\u011fin \u201c5 + 3 = ?\u201d) \u00e7\u00f6zmeleri istenir.<\/p>\n\n\n\n<p><strong>Avantajlar\u0131<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Kullan\u0131m\u0131 kolayd\u0131r ve h\u0131zl\u0131 \u00e7\u00f6z\u00fcl\u00fcr.<\/li>\n\n\n\n<li>Kullan\u0131c\u0131 dostudur ve eri\u015filebilirlik a\u00e7\u0131s\u0131ndan daha uygundur.<\/li>\n<\/ul>\n\n\n\n<p><strong>Dezavantajlar\u0131<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Basit i\u015flemler botlar taraf\u0131ndan \u00e7\u00f6z\u00fclebilir.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Kaydirmali_Slider_Captcha\"><\/span>Kayd\u0131rmal\u0131 (Slider) Captcha<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Kullan\u0131c\u0131n\u0131n bir kayd\u0131rma \u00e7ubu\u011funu belirli bir noktaya s\u00fcr\u00fcklemesi gerekir.<\/p>\n\n\n\n<p><strong>Avantajlar\u0131<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u0130nsanlar i\u00e7in h\u0131zl\u0131 ve kolay bir \u00e7\u00f6z\u00fcmd\u00fcr.<\/li>\n\n\n\n<li>G\u00f6rme engelli ki\u015filer i\u00e7in daha eri\u015filebilir olabilir.<\/li>\n<\/ul>\n\n\n\n<p><strong>Dezavantajlar\u0131<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Baz\u0131 yapay zeka destekli botlar taraf\u0131ndan a\u015f\u0131labilir.<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"reCAPTCHA\"><\/span>reCAPTCHA<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Google taraf\u0131ndan geli\u015ftirilen ve en yayg\u0131n kullan\u0131lan Captcha sistemlerinden biridir. Versiyonlar\u0131na g\u00f6re farkl\u0131 \u00e7\u00f6z\u00fcmler sunar:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>reCAPTCHA v2<\/strong>: Kullan\u0131c\u0131n\u0131n \u201cBen robot de\u011filim\u201d kutusunu i\u015faretlemesini gerektirir. Bazen ek olarak bir g\u00f6rsel do\u011frulama testi sunar.<\/li>\n\n\n\n<li><strong>reCAPTCHA v3<\/strong>: Kullan\u0131c\u0131 etkile\u015fimini analiz eder ve herhangi bir giri\u015f gerektirmeden bot olup olmad\u0131\u011f\u0131n\u0131 belirler.<\/li>\n<\/ul>\n\n\n\n<p><strong>Avantajlar\u0131<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Kullan\u0131c\u0131 deneyimi a\u00e7\u0131s\u0131ndan rahatt\u0131r.<\/li>\n\n\n\n<li>Geli\u015fmi\u015f g\u00fcvenlik sunar.<\/li>\n<\/ul>\n\n\n\n<p><strong>Dezavantajlar\u0131<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Google altyap\u0131s\u0131na ba\u011f\u0131ml\u0131d\u0131r.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Captcha_Guvenligi_ve_Asilma_Yontemleri\"><\/span>Captcha G\u00fcvenli\u011fi ve A\u015f\u0131lma Y\u00f6ntemleri<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Captcha sistemleri, geli\u015fmi\u015f yapay zeka ve otomatikle\u015ftirilmi\u015f botlar taraf\u0131ndan a\u015f\u0131labilir. \u0130\u015fte baz\u0131 yayg\u0131n a\u015f\u0131lma y\u00f6ntemleri:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>OCR (Optical Character Recognition) Teknolojisi<\/strong>: Metin tabanl\u0131 Captcha\u2019lar optik karakter tan\u0131ma yaz\u0131l\u0131mlar\u0131 ile \u00e7\u00f6z\u00fclebilir.<\/li>\n\n\n\n<li><strong>Captcha \u00c7\u00f6zme Servisleri<\/strong>: \u0130nsan g\u00fcc\u00fcne dayal\u0131, Captcha \u00e7\u00f6zme hizmetleri bulunmaktad\u0131r.<\/li>\n\n\n\n<li><strong>Makine \u00d6\u011frenimi ile \u00c7\u00f6zme<\/strong>: Yapay zeka destekli botlar, resim ve metin tabanl\u0131 Captcha\u2019lar\u0131 \u00e7\u00f6zebilir.<\/li>\n<\/ul>\n\n\n\n<p>Bu tehditleri \u00f6nlemek i\u00e7in Captcha sistemleri s\u00fcrekli olarak geli\u015ftirilmektedir. reCAPTCHA v3 gibi sistemler, kullan\u0131c\u0131 davran\u0131\u015flar\u0131n\u0131 analiz ederek botlar\u0131 engellemeye \u00e7al\u0131\u015f\u0131r.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Captcha_Alternatifleri\"><\/span>Captcha Alternatifleri<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Baz\u0131 kullan\u0131c\u0131lar Captcha&#8217;lar\u0131 rahats\u0131z edici bulabilir veya eri\u015filebilirlik sorunlar\u0131 ya\u015fayabilir. Bu nedenle alternatif y\u00f6ntemler de kullan\u0131lmaktad\u0131r:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>E-posta ve Telefon Do\u011frulama<\/strong>: Kullan\u0131c\u0131lar\u0131n e-posta veya SMS ile do\u011frulanmas\u0131.<\/li>\n\n\n\n<li><strong>Honeypot Y\u00f6ntemi<\/strong>: G\u00f6r\u00fcnmez bir form alan\u0131 kullan\u0131larak botlar\u0131n otomatik doldurma yapmas\u0131 engellenir.<\/li>\n\n\n\n<li><strong>Davran\u0131\u015fsal Analiz<\/strong>: Kullan\u0131c\u0131n\u0131n sayfa \u00fczerindeki hareketleri analiz edilerek insan olup olmad\u0131\u011f\u0131 belirlenir.<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Sonuc\"><\/span>Sonu\u00e7<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Captcha, bot trafi\u011fini ve spam\u2019i \u00f6nlemek i\u00e7in kullan\u0131lan \u00f6nemli bir g\u00fcvenlik mekanizmas\u0131d\u0131r. Farkl\u0131 Captcha t\u00fcrleri farkl\u0131 avantajlar sunar ancak geli\u015fen yapay zeka teknolojileri, baz\u0131 eski Captcha y\u00f6ntemlerinin etkisiz hale gelmesine neden olmu\u015ftur.<\/p>\n\n\n\n<p>Web siteleri i\u00e7in en iyi g\u00fcvenlik \u00e7\u00f6z\u00fcm\u00fcn\u00fc se\u00e7erken, Captcha\u2019n\u0131n yan\u0131 s\u0131ra di\u011fer koruma y\u00f6ntemlerinin de kullan\u0131lmas\u0131 \u00f6nemlidir. Google reCAPTCHA gibi modern \u00e7\u00f6z\u00fcmler, kullan\u0131c\u0131 deneyimini bozmazken y\u00fcksek g\u00fcvenlik sunmaktad\u0131r.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Captcha Nedir? Captcha (Completely Automated Public Turing test to tell<a href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/\">&#8230;<\/a><\/p>\n","protected":false},"author":4,"featured_media":22912,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[10],"tags":[707,708],"class_list":["post-22909","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-terimler-sozlugu","tag-captcha","tag-recaptcha"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v18.1 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.cenuta.com\/blog\/captcha-nedir-bot-trafigini-ve-spami-onleme-yontemleri\/\" \/>\n<meta property=\"og:locale\" content=\"tr_TR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Captcha Nedir? 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