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Yes, try quake live.http://www.quakelive.com/
quakelive.com is one of the easiest fps online PC games that you can play.
Halo 2
One game on Facebook that is a FPS game is Paradise Paintball or now known as UberStrike Another one I know of is Brave Arms I hope this helps and red crucible
There is no best, it's all based on opinion. I personally though like MGS4 and COD:MW2