I’ve been thinking about leaving it since a while as well.
For several reasons – a lot of them have been mentioned above already.

What you surround yourself with, what you occupy your time with, you will become more of that. So is facebook the kind of ‘environment’ i want to be influenced by?
I think i used to – or maybe still, but slowly trying to grow out of it – have a strong inclination to ‘needing to be seen by others’ in order to exist. I never was like one of those super active facebook users but facebook of course, does increase this way of feeling a lot. I’ll post something, and then other people (whether friends, or vague acquaintences or people who i would like to impress…) will see it and they will think that i’m clever (or whatever). That kind of attitude, which is growing too much in our world. So i would rather leave it, cause it is cultivating unhealthy habits and attitudes in myself, that i would like to decrease instead of increase.

Also, comparing with other people indeed. I personally have to be very, very careful with comparing, and i’m not the only one. Especially in moments when i’m tired, i can find myself looking on facebook, looking at others peoples’ pictures, and looking up more and more people, from secondary/primary school, people i once met… See what they do, how shiny they look… Only for that alone, i’d like to leave it. It is not good for my mental health. Let alone the time that i spend doing that, imagine i would use that time on myself, for learning or doing things i would enjoy…

Facebook is for me mainly about creating a persona, a way you represent yourself to the world. That is something that we in real life also tend to do. ‘I’m a very helpful person’ ‘I’m the cool guy’ ‘I’m so full of new ideas’… While, reality, and real people are always much more complex than that. Also in real life it can be hard to experience ourselves with all our aspects.

For a while i wanted to stay because it was an easy way to keep in contact with people. I moved to an other country and have only a few friends in my own country. So for one or two of them, who are posting updates about their life, photos of their children, or their trips, for them i am honestly happy that i can see those photos. I feel that i have a bit more insight in what’s going on in their daily life. (although i don’t do it myself cause i don’t find myself that interesting). But then, when i talk or mail to them personally, and you get the whole picture, they are having a hard time coping with everything – why do i let myself fool around by facebook…? It is actually a way of creating more distance between me and those friends, cos i see their lovely pictures, i am happy for them, and leave a nice comment, and that’s it. If we are really friends, then i can much better send a personal mail or text, even just to say hi and how are you, and the contact will be real and personal. But of course, that takes more risks, because they sometimes don’t reply and then i feel ignored or rejected.

Also i do enjoy long, personal e-mails or nice, serious or just funny chat sessions a LOT more, of course, they are much more satisfying.

I can’t even tell you how many times people will tell me about being upset regarding a post someone wrote. You are right, it instigates a lot of problems in real life that probably would not exist if it were not for FB.

Yes i’ve always found that inredibally funny and interesting.

So, actually i have more than enough reasons to delete it and i should do it rather today than tomorrow.
But. I am very shy, socially anxious, and don’t make easily contact with people. So i feel that facebook sort of makes up a little bit for pieces of information that i get through facebook.
News from the town where i live – sometimes, not too much actually.
I joined a lot of groups about topics that interest me and that i’d like to learn more about – so i do get some information or ideas or articles through them. But probably, i would also find these things through, for example, reading interesting blogs or discussion foras. And this way actually seems to distract me from learning, because i’ll spend much less time reading books because of facebook.

At the moment i am following a lovely online course, about something interesting and i’m very glad to have discovered that website. And that’s what bothers me: i found that course, because somebody put the link for it, on the wall of a friend. So i’m just afraid to miss out on these things by leaving facebook. Since i don’t have much contact with other people, i don’t get that input through that way.

But i do think i’ll take the step to remove it soon and it might make my life more healthy and interesting.