Are you human? (or How to prevent spam)

Posted by pek on Stack Overflow See other posts from Stack Overflow or by pek
Published on 2008-09-03T16:34:51Z Indexed on 2010/06/13 21:32 UTC
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web-development

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captcha

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forum-spam

What mechanisms do you know that prevent your site from being abused by anonymous spammers.

For example, let's say that I have a site where people can vote something. But I don't want someone to spam something all the way to the top. So I found (a) creating an account and only allowed to vote once and (b) CAPTCHA to decrease spam. What other methods do you know and how good do they work?

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