Earlier quoted context omitted.
That arguably changes when the President starts to use it as a primary means of communication with the citizenry.
They didn't remove his message. They merely pointed out it was misinforming the public. Speaking of which, shouldn't we make it a crime to lie or substantially mislead the public while holding public office?
Why should a private company have this power? I don't think that people who run a successful website automatically are qualified to fact check the president and insert blurbs directly in his messages. That needs to be regulated some way.