As far as CYA, I read on a local Montgomery County forum about Section 230 of Title 47 of the United States Code (47 USC § 230).

Section 230 says that "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." This federal law preempts any state laws to the contrary: "[n]o cause of action may be brought and no liability may be imposed under any State or local law that is inconsistent with this section." The courts have repeatedly rejected attempts to limit the reach of Section 230 to "traditional" Internet service providers, instead treating many diverse entities as "interactive computer service providers."

There was much more information on a referral site, but I guess a lawyer would have to study it for PoliticsPa.  However, something is needed to return these forums to what they once were.