It's not considered a 4th amendment violation for a cop to ask to search your house without a warrant. It's only unconstitutional if you say "No" and they do it anyway. If the FBI talked to Facebook but there was no coercion, I'm not sure what the 1st amendment violation would be. Although it's still something worth being concerned about (e.g. what else is being censored by FB? What if there's unofficial coercion? Should FB tell users who are being semi-censored?)
Yep the FBI should not be communicating with FB regarding what to suppress and not suppress --that would be outright "Censorship Office" kind of stuff, unless the information is regulated in some way (i.e. illegal doxxing, state secrets, etc)
They didn't do that here, though. Please read the article–the FBI talked to Facebook prior to Rudy's disinformation campaign around the laptop, and Facebook realized it (correctly) had the hallmarks of a Russian disinformation campaign, and chose not to amplify its reach (they didn't ban the story entirely).
