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How about an SMS verification code sent to the user's mobile phone?

• jrockway 14y ago
  Mobile phones are $30 at your nearest bodega.
  • joshschreuder 14y ago
    Meaning that multiple entries are very cost-prohibitive. If you want to enter 100 times with Facebook, you can buy 100 Facebook accounts for much cheaper than the $30 * 100 mobile phone cost.
    • jrockway 14y ago
      In that case, you can just get a VOIP number for 8 cents or whatever.
      • shawndrost 14y ago
        It might be possible to prevent this. Craigslist somehow detects when you use a Twilio number.