my brother is being black mailed into sending Money over a sexual video?

He was ashamed to ask this so I wanted to help him. He knows it was dumb but he started talking to this girl from Facebook.  She sent him a friend request & they had a friend in commen . Well she wanted to talk to him on hangouts and asked him to video chat , so they did and when he got on video with her a girl was on there and started doing sexual things and he didn't know if she was actually real or not and he was curious so he done a sexual act and shown his face after the girl types in she wants to see his face. He said when he seen the girl on video it looked kinda fake and he just wanted to see what would happen so unfortunately after about 2 minutes a video played on her end of him. She recorded him & then hung up and he received a message saying either do what I say or this video will be sent to everyone of your Facebook friends and on youtube and that i will ruin your life unless he sends her at least 200.00 bucks . She wanted 1,000 but all he had was 200.00 and they said they would take 200.00 . This isn't a joke my brother is a really good person who made a mistake. Please can someone give us some advice here. He says he is never going to  accept a friend request ever again until he knows who it really is.