Social Networking - Just Another To Do Item?

It recently occurred to me that I haven't really spent any time on any of my "fun" social networking type of websites in 10-14 days (really, it could be longer...I've lost track of time).  I think I posted one quick status at 3am asking if "being busy was a good thing."  Here's what I don't get.  When I go on vacation I LOVE the fact that I'm disconnected from the world.  But for some reason, being home and being too busy to visit Facebook or Yelp or web forums (that I'm typically a regular in) makes me feel REALLY BEHIND.  Just like one might get behind on emails (which is also happening to me, both work and personal).  I finally mostly caught up on work emails the other night when I worked from 6pm till 1am getting "caught up" but I'm still behind on other stuff.  I literally added a task item on my Task List to visit a particular web forum to write a post and update my 'online friends' on recent happenings (and I don't mean Facebook, I mean on relevant news related to the topic the entire forum is about).  I've "snoozed" that task for 2 days now.

What's with this?  I don't like it.  I don't like how I feel obligated to "keep up" with FB or any of the other places I often frequent when I don't have as much going on.  Are social networking sites putting added stress on people like myself?

To my friends who are reading this blog because I posted it on FB, I am taking this opportunity to apologize for not having read any of your status updates in the last few weeks.  If there is something I should know that is going on in your life...please email me.  I'll get to that in a few days :).