[joshuamorton]

What scale is that? As far as I know, within the US, fox has wider reach than Facebook, and it's under no such obligation, and the US is perhaps the only nation that's going to force the definition of free speech you propose on Facebook. Europe certainly won't.

[reitanqild]

There are currently realistic alternatives to fox for anyone.

The same cannot be said for Facebook or Google at the moment even if some of us prefer Google+, HN, Twitter and Duckduckgo personally.

(That said Duckduckgo can go mainstream soon for what I know and Google+ is IMO constantly one or two good and well timed moves away from eating Facebooks userbase.)