They know I browse, but I refuse to let on what my screen name is and since it's totally different than any other screen name I have (I normally keep them the same), they may continue to stay in the dark as to my posting ability.
I keep my internet life separated from my real life, period.
At one point, I recognized someone's profile pic as a coworker I couldn't stand. Never said anything. Luckily, I haven't seen him on here in a really long time. I think there may be a few other people who I know offline around here, but I try to avoid guessing who's who.