This is complete and utter bullshit.
This type of information would only work on JWs, because they see the borg as an authority over their lives. However, no matter what they think, the WTS has absolutely no more legal power than any other company. They are not a governmental entity. They can't go around making people or companies do or enforce certain things. They can't get a warrant/subpoena for information. All they can do is what any other company can do, or even you or I: send a cease and desist letter (whine), and threaten to sue. But when the identity of the Facebook/Google account is unknown, who will you sue? Facebook and Google? Their legal departments will own WTS in court and take whatever money they have left.
This just shows how insecure they are about their beliefs. I wouldn't doubt the first part of this bit of info that there's a lot of Facebook posts/YouTube videos with content that denounces/disproves JW doctrine, but I think this was all made up by some angry/butthurt elder who can't handle the cognitive dissonance. He has no evidence to back his claims, so, as far as I know, he's talking out of his ass.