I received your email telling me that you would want to join Facebook. Facebook, which has been growing up a lot during the last year.
First of all, Facebook, as a global page, can keep you in contact with lots of people. As an example, last year I met a boy called John and we still talk on that media site.
Secondly, I don't think Facebook is going to take so much time to you, it depends on how much time do you want to spend. For example, on exams time I do not use that page, and when I have some time I post and read at other's users posts an I check new profile, so you can use it when you haven't got more things to do.
Concluding, I think that Facebook can perfectly suit with you, and would be amazing to see you there as soon as possible!
I look forward to hearing from you,
Regards,
Lluís