Hit Comcast with an Anti-SLAPP suit.
Strategic Lawsuit Against Public Participation. If your site is merely posting facts & Comcast is trying to stop you from doing so, get a lawyer to draw up Anti-SLAPP paperwork. The moment those papers land on the judge's desk Comcast will be in a ton of deep shit. Judges tend to bitch slap (pun not intended) the overly-aggressive party for trying to violate your First Amendment Rights to Free Speech.