Integrating reCaptcha on Your Website for Spam Prevention

Whenever you have a form that is exposed to the public, that page will always be prone to spam. The most common target of spam is a comment form. Some would like to spam to someone else's site to promote their own site for the sake of search engine optimization. I'll talk about search engine optimization as a future topic but for now, let's talk about how to deal with all these spam.

The most obvious way is, of course, to use a captcha, which (by definition taken from google's recaptcha) is a program that can tell whether its user is human or computer by using colorful images with distorted text. For our discussion, let's utilize google's reCaptcha, which looks like the following...