Friendster's firing is nothing new (see microsoft).. but may warrant more attention to casual bloggers to: "Never tell them your real name!"
But probably a corporate-like disclaimer will do..

DISCLAIMER: All postings on this web site are purely FICTIONAL - it is not actually written, does not exist and if all else fails its 100% virtual anyways, why take it too seriously? Any resemblence between anyone and any real person, living or dead, is an merely a COINCIDENCE.

Now.. blog on!