Twitter gets a lot of celebrities and media figures in trouble.
If I were the Jack over at Twitter, and saw that comment from POTUS which he refuses to call his Twitter account-Twitter, but instead just social media? I'd suspend his account. The use of the brand name is revenue. If a user, any user, were to publicly demean or refuse to use the brand name of the product which he exploits, then he's technically violated the terms of use.
Kicking the Loud-Mouth in Chief off his primary way of communicating with voters two weeks before the election? That would REALLY hurt.