well, there was a commit to svn with the following message in the same tag (it's slightly different than the one I just saw, actually):

cool site nice work man thx <a href=" http://www.imeem.com/people/v8HdrAP ">you tube red red wine</a> =)

 <a href=" http://www.imeem.com/people/sYXjvTP ">porntube passwords</a> bookmark you '

But I realised, that it's not sure how the commit was done (I may have done the commit with the wrong message). A captcha might not be an adequate solution.
On a form of protection should decided when it's clear how it was done.