Being without Facebook for Lent has actually been an interesting study on how I and my friends depend on it. I have had to jump back on my account for information a few times so far. Each time, I promptly go on, find the information I'm looking for, look at a few news feed items (I can't help it), then re-deactivate my account.
The first time, I was looking for someone's contact information for a family member, someone I didn't know but I thought I might find on Facebook. I've had at least one person ask Curtis where I went. Just today, I wanted to make sure that someone hadn't put something on Facebook before I contacted them. It's hard when you're so active on Facebook - friends (including me) depend on the information that is there. It's just assumed that when you post something, all of your friends find out about it. I've had to tell at least one friend to make sure to email me when something big happens in their life (today - medical residencies are announced) - because I won't find out on Facebook.
Aside from that, I actually haven't missed it much. I don't yearn for the information - I continue to get the news I'm interested in on Twitter. But I'm looking forward to my return so I can see everyone's baby pictures and other family news. I'm looking forward to sharing pictures from Juls' wedding and seeing the other pictures people post. And I'm looking forward again to being able to share my own commentary on current events and discuss these issues (serious and silly) with my friends.