title: how to stop bots signing up without captcha or email verification
body: <p>I've seen a couple of websites (for instance - crowdrise.com) where it seems you can signup for an account and create pages on their website without once having to click a link in an email or having to type in a captcha at all.</p>
  
  <p>So how do they go about doing that without having robots on their site creating profiles and pages?</p>
  
  <p>Thanks :) Julia</p>