One of the most popular and very effective methods to combat spam is to use some form of captcha protection. But, captchas can lead to poor user experience. reCAPTCHA by Google is a quite different captcha trying to minimize user interaction. Before you go on with this post, check out the previous parts in this series about the comment spam: reCAPTCHA reCAPTCHA is a new version of captcha developed by Google, and it is also known as ‘No Captcha reCAPTCHA’. It works quite differently from other captcha systems, and in most cases, it required only to click on the checkbox. Once in a while, reCaptcha requires you to solve some visual (or audio) puzzle – select images according to the keyword or by type. Here is the example of how it works, and you can click on the image to visit Google home page to learn more. reCAPTCHA example, visit Google page for detailed information Test setup To test how effective reCAPTCHA is, I have used data gathered on Dev4Press blog between March 23, 2016, and March 29, 2016, as a control period where no antispam method is used. This is the same data used as the control for previous Honeypot effectiveness test. reCAPTCHA is used between April
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