Long story, but I've ended up becoming the admin of a group on Facebook (the previous admin stepped down in a rush, and added me as he left). And the group has an existing group chat associated with it.

Is it possible to "moderate" this group chat? Specifically, as an admin of the group, can I remove unsavoury/unwanted messages from the chat associated with the group? It looks like I can't.

Can even the creator of a group chat do this? If I close the group chat and create a new one, will I (as its creator) be able to remove unsavoury/unwanted messages from that new chat?

I've done some searching via Google, and I'm not finding anything to indicate that this is possible. If someone posts something unsavoury in a group chat, it looks like the only option is to remove the person from the chat - but the unsavoury messages can't be deleted.

Please tell me that's wrong!