At least right now, til they go with their IPO, Facebook IS A PRIVATE not Publicly owned Company and I would presume right or wrong that as long as they remain Pria vvte they can set their own rules
Like some Restuarants in Arizona that have sign as you go in "We speak ONLY English here"
Guess Marck Z can limit whar he wants to on Facebook, lets see what happens when it goes pub;ic, almost any Resturant you go to you may find a sign on the dpor or by the front that says "WE reserve the right o refuse ayone serve" as a Private entity they do, none of this mentioned is either in support of or not supporting what Facebook i doing, but the reality is they are a PRIVATELY HELD COMPANY