MC when he finds out about a person he doesn't like posting pictures of William (his cousin) without his consent:

Ok someone deleted

I've unfeatured it

Who's the first one to find out about the predoman reposting pictures of William and adding inappropriate captions on it without his permission?

MC was. He later told William's parents and took action. The FHC had a notification from them and they also took action by taking the posts down. No arrests were made.