I don't really talk all that much on DA... I have all my DA friend's facebook's so if it's not specific art piece related we generally chat there. I also use facebook because it's easier to keep in contact with family (after moving half way across the country), of which none of is on DA.
I guess I should also mention I HATE using phones. HATE phones.
ya know i still like myspace (granted noone uses it), and i dont see how facebook is better. i think that myspace adds a nice personal touch, and its always easier to manage apps and comments. i think facebook looks neat, but on its side is very cluttered. i use it because everyone else does. deviantART is nice, but really only pertains to those with artistic interests. in that respect it is limited...
remember when Myspace was dominant? Oh how time flies online... but DA isn't that well up for socializing IMO, besides a few art school kids (like you) I talk to most people on Facebook. I only started using Facebook instead of Myspace because everyone moved over to that. I do miss personalizing and decoring my Myspace...sigh