By not using your real name and picture as your avi is a start.
beat me to it .
use email no one knows
and get rid of ur pictures !
Put a bag over your head?
don't ever post anything that could help to identify you. like your "Special Day" on your homepage...is that your real birthday?
don't mention where you live/lived, go/went to school
Wear a disguise.
Don't tell them your on here.