Your popularity is in no danger right now, even though you might be worried. Why isn't the phone ringing as much as you would like? Why not just get more proactive about your social life? Instead of waiting for an invitation, throw one out to someone else! Pick a person who always makes you smile, who always has some juicy stories to share, and most importantly -- who you haven't had quality time with for a while. They are just as eager to see you as you are to see them.