Actually, that's probably an even better idea than it might seem at first glance.

If I were looking to hire a DBA, and a candidate had "active on SQL Server Central and ... (list of other SQL web pages) ...", and could prove they had a certain screen name and certain level of activity, that would have the potential of being a major plus in the hiring process.

I'd be able to look up the discussions the person had been involved in, and get a feel for personality, skills, etc., outside of the horribly artificial environment of an interview or CV/resume. Are the posts professional, personable, helpful, etc. Does he always recommend cursors on global temp tables with clustered indexes on nvarchar fields in his solutions to questions asked here, or is he sane? Does he ask questions to expand his own skills? Does he insist that his way is "the only right way" or accept input from other people?

All of that can be demonstrated in places like this web page, and could go a long ways towards helping to determine the hiring answer.