Actually.. Not true, your facebook, forums, myspace, ect any kind of interent social life, reflects just as much as your personal life does. I've known a few people who've been in serious trouble for there internet actions.
My local police force actually fired a few cops for their facebook accounts.
When people run backround checks, they actually check out that kind of stuff to.
A forum is pushing it, but the facebook and myspace are main.