When I was in school, it was a really big thing, so of course I enjoyed it. Now that i'm about to enter post-education life, I am starting to find that I don't need it as much as I once did. Face-to-face interaction is so important, especially for something like the education field.
I don't like the idea of sharing everything for everyone to see. I keep personal things to myself most of the time, and only share things when they really matter. I also (as a teacher) have to make sure that the privacy settings on my profile are very high (due to the nature of my work), whilst considering everything I put on there in case a parent or a community member happens to get a hold of it.
I primarily use Facebook for learning about things that are going on - e.g. news, pages of music/tv shows etc and friends, as opposed to sharing and posting things myself.