Look at other things like your IP, user agent, etc. Spammers, things done by scripts... They give themselves away really easily. All I want is an obstacle enou

Look at other things like your IP, user agent, etc. Spammers, things done by scripts... They give themselves away really easily. All I want is an obstacle enough that I know people aren't spamming and that if they troll they understand that it will reflect on their reputation. Do I need a real id? Nope. And clearly Quora don't either as they don't require over 99% of users verify their real id. It's just a spam prevention policy and helps cut down on trolls as it will (or has risk that it will) reflect on you. It's really not a good thing to start applying onerous terms and your users.