He could send a mail to support but I don't know.
Some people are stupid but some are pro if you know what I mean.
But I want to add something.
I 'm a member in some fb groups like yours, with some hundreds or thousands members.
The moderators there, are responsible for those forums.
They should know some basic rules of the game (like those non legit actions above) and they must inform the members, prevent them to make posts, or doing businesses there.
I 've seen some times, mods of fb groups clicking the "Like" button in posts as
- Does anyone want to buy tokens ?
or
- I'm selling my team with official jerseys and many tokens