Okay, so he's not chasing children but he is grooming vulnerable women and girls. I've seen the messages and it is grooming, a gradual drip drip drip of compliments and gaining of trust and confidence before he swoops in and takes advantage.
What? Waste time for a trivial thing and bore some poor sod with the dreaded F word and yet another fall out where social networking has a part to play? No, sorry, I'd be embarrassed to walk in and 'report' something like that.