The biting will go away, but it will take a few months, as he is still a baby and still learning. They all do it, and they all stop eventually. Just hang in there and keep telling him "No bite" Tell your friends to just pet and don't play with him, until he grows out of this phase. They do like to play rough, it's just a bullies nature, but they do settle down as they get older. Every time he bite, you need to yelp loudly and tell him no bite, then give him a chew toy. If he still wants to bite it's time for a time out. They are like kids, if they get tired, they get crazy, and it's time for a nap.