[r00fus]

No need for that; EU can essentially poison EU markets for FB (sanctions/fines/blocks). Most shareholders will act accordingly and tank the stock. Even if Mark can ignore because he holds most of the voting interest, this directly impacts all vested workers, so becomes an HR nightmare.

[blitzar]

Why not do both? It would be so much fun - Facebook execs too scared to got to fly the jet to Europe for fear of being cuffed when they land.

The reality is facebook would happily pay the fine and the real loser would be the US taxman - in response the US would drum up some more "fines" against some European companies as payback. All of this has happened before, and it will all happen again.