Audioship - Upload audio to YouTube or Facebook
Parallel - Listen to music with friends over Spotify at the same time
Move to Apple Music - Convert your Spotify playlists for Apple Music
Join My Playlist - Listen to music live together with your friends in Spotify.
podsync - Simple and free service that lets you listen to any YouTube or Vimeo channels, playlists or user videos in podcast format
TuneMeet - Chat with people who are listening to the same song