Probably because Twitter has actively wooed journalists by giving them easy access to verification, greater prominence on the platform, and helping to supply th

Probably because Twitter has actively wooed journalists by giving them easy access to verification, greater prominence on the platform, and helping to supply them with an endless source for stories (helped by the fact that it's inherently much more public than Facebook posts). Also, a lot of the political vitriol on there is in aid of causes the journalists support.