When I had it not showing, it pretty much worked. The only thing that might give anything away is pronoun usage. Like if you post from an app, it might say something like, "So & so made too much roast chicken in cafe world, & would like to share with his friends."
I know they just changed a bunch of things on there though, so I'm not sure. I spend a lot more time playing WoW than surfing FB. Social networking just doesn't do that much for me. If someone really wants to talk to me, I have a shiny red cell phone.