Those features were requested, and I think they would enrich really team as they are on lichess right now :
www.reddit.com/r/chess/comments/3evlp4/are_there_any_chess_sites_that_offer_a_multiuser/
www.reddit.com/r/chess/comments/3evlp4/are_there_any_chess_sites_that_offer_a_multiuser/