Give the option to show PSN/XBL/Bnet/Steam/etc names to the Twitch user cards.
We're all gamers, so why not show our tags so your friends can easily add you? This would also make it easy for Streamers who play with their viewers to invite their chat to their party/game.
Laurence Chan commented
shut up. stop talking
100% agreed. Making it optional means people can remain anonymous, should they so choose but having the option would to put it in your public profile would be great!