I'm rather introverted; if I don't absolutely trust someone, I tend to not say much.
Once I trust them I'll show them who I am.
That's why I hide online; if I make an absolute fool of myself and I'm laughed off the forums by a couple hundred people, I can come back with an alt and "restart". In real life, there is no such convenience. In real life, if I screw up, it's FOREVER.