Flash runs too slow. It's fine for some things but a Facebook game I play Castle Age Heart of Darkness it runs in slow motion. Load it in Chrome without changing anything and it runs fine. So because of that I got used to Chrome and use it under Windows now too.
Facebook is full of obviously fake named gaming accounts. You can report them but FB rarely suspends them. Anyone joining up to Facebook and listing Farmville University as their school or something should be blocked by FB automatically.
Zynga is killing themselves with all the spam your friends crap. I've played some of the ville games and the thing that really kills them is the spam 100 of your "friends" to get this or that and continue in the game. They'd make a lot more money sticking more with the sandbox than the spam.