Who are these people and who cut their hair?

I heard Band Aid's song Do They Know It's Christmas three times yesterday, once on the way to work, once one the way home on the same station. I changed the station and heard it again. It does bring back a lot of memories of the '80's but Three times in one day is a bit too much. Bob Geldorf, lead singer of the Irish band Boontown Rats, put together the group made up of some of the hottest UK and Irish rockers of the time. In the documentary film, Out Of Ireland, The Hit Songs and Artist of Irish Music, Geldorf tells of the making of the video. Bono, of a then yet unknown band, U2, reluctently joined in and Geldorf gave him his line in the song. Bono said that was the one line he didn't want but did it anyway. When the song was released it debuted as number one in Great Britin and two weeks later was number one in the US. Geldorf tells of going to Ethiopia after the song was out and one night at sundown, looking out over the plains the song was playing and Bono's line, "Well tonight thank God it's them instead of you" was perfect, just enough anger in Bonos voice. The songs popularity sparked an American version, We Are The World and also led to the Live Aid concert.
Now here's the big question, after watching the video, how many people can you name? The answer will appear in the comments section.