Well look for ok groups, get higher score and do it on TS or discord. I was in one group and we talked ( on english ) and 80% into dungeon i asked where are you guys from ( there was one girl there ) and to my surprise she was from same country and from same town, and ofc after we added each other and after few weeks we met.
So like I said, Blizzard didnt do shit, they only gave you more options to chose with whom are you going to play. The problem are ppl that wait till end of the M+ to start talking or joke or something.