In OW, you can view current players on the server as well as recent players through the social tab.
If you right click on a name in the current game menu, there is an option to "Prefer Player".
Now I'm not sure what exactly this does, so I tried activating it. I thought perhaps it would let me stay in the same team as him but for the next 4 matches, even though most of the server stuck around, including him, I was never matched with him once.
If anything, what does "preferring a player" do? If 6 players perfer one single player, and that player is the same, is it supposed to cluster them together? How does this work?