I fail to see how this is different from Facebook (and formerly Google+)'s real names policy which will flag unusual names and force you to give a valid Government ID to reactivate your account.

Facebook (along with Twitter) is often the gateway to commenting on a lot of popular sites in the US. Very few people stop and make the alternate account required.

References:

1. https://www.facebook.com/help/159096464162185

2. http://boingboing.net/2011/08/27/eric-schmidt-if-you-cant-us...