I play Zynga's games on Facebook. I have to say, Facebook is more popular than AG. It is endless what you can do over there.
You should never play games on facebook. Every time you click allow you're giving all your personal info and some of your friend's to any wanton dickhead that can string a bit of code together.
When I'm bored, I definitely play Minecraft. It is something that requires you to think and emphasize creativity, which needs a lot of brain power. It definitely alleviates my boredom, since the replay value of the game is second-to-none.
I usually bring out one of my old need for speed games i havent played in a long time and just start a new carrer. already know what happens, but from time to time i run upon things i missed or forgot.