I don't keep in touch, because I don't think to do so, nor do I really want to. I totally get where you other introverts are coming from. We really don't need to be around people, in fact, it's often straining and not energizing to do so for us. To say we need to keep tabs on everyone we know all the time, and constantly keep up to date on all our friends all the time, sounds like something a retarded type A dictator would say. I say, "screw you and horse you road in on", if my friends are real friends and they spend the time getting to know enough about me, to understand that, and if that offends them, then that's their problem, not mine. I hate when people are trying to guilt me, it drives me up the freaking wall, just like jakuwhat said.