What could go wrong by having the Zuck and his minions fact check? Naturally it's going to lead to chaos. Tech Bros. have no business even going down this road. Stick to what you know and are good at.
Nothing - it isn't chaos, it is the long standing status quo of free speech. Even a complete idiot flat earther can "fact check" NASA and no parade of horribles has come to pass from this.
'tech bro' is a pointless pejorative here. Misplaced, too, since it doesn't have anything to do with this.