I don’t know if they still do, but Facebook used to count viewing a web page with a Facebook “like” button as being an active user

Twitter has always been “small” but popular with people who work in the media, so you hear it mentioned on the same level as Facebook by those people, even though it’s never been any where near the same size

The only person who has true freedom of speech on Twitter is Elon Musk. If he doesn’t like something you say (for example apparently he doesn’t like the term ‘Cisgender’), he can ban you