you can always send a friend request and make a party (I dont know how its called the PS party). Invite him to your fireteam and go party,thats what I did. You can also look for companyons here,thats why bungie did this web right? Clans and everything... But the ingame chat is there,in xbox360 at least I could speak with my friends through game (Maybe because we were in the same fireteam?)