If you follow someone or are friends with someone, you can go to the "Matching" tab. There is a table visible. If friends of yours are online you can see them there with a status like "Logged in" or "At table (player/spectator)". If they are at a table there is a button to join them.
I think, it was said, that in the future it will also be possible to invite friends directly to game.
I think, it was said, that in the future it will also be possible to invite friends directly to game.