[mlyle]

Facebook is not a common carrier, but enjoys liability protections under the CDA Safe Harbor:

47USC230(c)(1) "(1)Treatment of publisher or speaker No provider or user of an interactive computer service shall be treated as the publisher or speaker of any information provided by another information content provider."

And definitions-- 47 USC 230(f)(3) The term “information content provider” means any person or entity that is responsible, in whole or in part, for the creation or development of information provided through the Internet or any other interactive computer service.

Of course, CDA also excuses Facebook from making tilted or faulty moderation decisions in good faith.