well, I'm of the position that people should be able to say whatever they want, as long as its not blatantly libelous and/or slanderous, or in any other way illegal [like advocating riots or other crimes]. But the grips on that kind of thing are rather loose, and so you'll see occasional things that might offend you. Oh well. Grow a thicker skin, I say.
The thing about Fa[e]ceB[ook,@#$%] being as large as it is, accused of filtering news in a way that favors their own interests [whatever that might be], is what's apparently at question here. I say 'no filtering' and leave the liability with the individual posters. That's the simplest way to avoid quelling speech while simultaneously giving FB [and others] the means by which they can do T.O.S. bans as necessary. If that means banning every conservative or right-winger off of their network, I say "their loss of revenue". I certainly don't need FB for _MY_ news, nor google for my searches. Or whatever.
But you know, business is business, and politics is politics. The smart business owner will realize this and NOT "play politics". Everyone's money is the SAME color. Welcome, valued customer!