So you can find someone that you have previously battled in ranked and casual. Make new friends or enemies lol. Gears 1 vibe weapon swaps party chat disabled
When you have played with someone you like, you can friend them, they do not have to accept it, but you can still do it anyway. Also, after a game, they show up on your friends list tab page thing. Just press the Xbox button, go to the People tab and look at Recently played with. There, problem solved.
Or, remember their name and search for it on the same tab, it is called Find someone