should we use a captcha for Sign Up ?

Posted by fabrice on Stack Overflow See other posts from Stack Overflow or by fabrice
Published on 2010-03-15T10:13:13Z Indexed on 2010/03/15 10:19 UTC
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Hello, I know it's not really a programming question but I don't know where to ask it.

Should i use a captcha in my sign up form ?

Facebook, twitter, foursquare, gowalla etc... don't use one (or not a visible one). Is there an invisible catpcha on theses sites ?

Thank you

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