CTL, why would it be a violation of the First Amendment and not a regulation of interstate commerce? If Facebook may not erase someone’s post Zuckerberg’s speech is not be affected. Beside’s Facebook is a public corporation so it is not included in the Hobby Lobby precedent. He can even post a disclaimer.
The Congressional Research Service has an online article entitled “UPDATE: Sidewalks, Streets, and Tweets: Is Twitter a Public Forum?” On page 2 it states “The government can designate new public forums by making “an affirmative choice” to create a space
that is open for public expression. The Supreme Court has recognized that the Internet in general, and social media in particular, has become a critical forum for the expression of protected speech. And the federal courts of appeals have held that the government can create public forums on the Internet.” See the PUTNAM PIT, INC.; Geoffrey Davidian, Plaintiffs-Appellants, v. CITY OF COOKEVILLE, TENNESSEE; Jim Shipley, Defendants-Appellees
No. 98-6438 (Sixth Circuit).
As for your polling place story, it sounds like a case in the Gemara (I can’t find exactly where right now) where someone who hadn’t come to a certain bet midrash in thirteen years suddenly showed up to clear up a subject of debate. Maybe you should put it in one of those hashgacha peratit books.