Don't let these groups fool you into inviting and spreading there scams.
These groups are just there to scam you and your friends.
This week you probably got 4-5 invites or maybe more
(maybe you got alot of friends and they invite you all)

What do they do?
They send you links for sites to scam you and your friends.
Don't click on it or do anything. Try asking your friend why did he send that chat
message. If he doesn't know anything don't trust it.

in other words. don't accept scamgroups. Don't join them, and don't send your friends things that you don't even know a thing about