by Sam Mauzy
Anyone that frequents message boards is familiar with the terms “troll” and “spammer.” These are people that sign up for a message board solely to spam it with comments and links. This happens all over the Internet, from message boards to blogs to the comments section on news articles. To prevent this many webmasters are adding a new security feature when users sign up for a site or post a comment. It is called captcha, which is an acronym for Completely Automated Public Turing T...