I have a Facebook account, mostly for my university group there. Quickest option for asking - Forums and the like don't get enough activity due to FB unfortunately. I don't really post much though, generally not a fan of it. But it just has some few advantages that I don't want to miss out on.
As for the reasons stated...
1. Unconscious addiction
Doesn't apply to me - I do have problems with wasting way too much time browsing, but that doesn't have to do anything with FB
2. Low self-esteem
I don't compare myself to others on FB..
3. The job hunt
? Just don't post anything really stupid and you're fine.
4. Applying to university
See above, even more so (I doubt any university here takes the time to check your Facebook)
5. The breakup
??
6. Facebook envy
See 2?
7. Exam time
Again, Facebook here isn't really my problem, it's other sites - But there's a great Firefox AddOn for that anyway, LeechBlock :P
8. Privacy
My biggest concern with FB - I don't post much though, keep my profile pretty restricted and try to block as much tracking as possible with several Addons (NoScript, AdBlock, Ghostery, SelfDestructing Cookies, BetterPrivacy)
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