Usually occurs when the network administrators take their rules too literally i.e.
1. Having too many friends
2. Being a member of a banned group
3. Sending too many messages
4. Not using your profile much
Can also occur when a third party asks you to shut your profile down, such as your employer when they think you are networking in work time.
JOHN: Thanks Dave, but that wasn't my intention. I was catching up with friends on Facebook during my lunch break, and before you know it, I'm dragged into the office and given a bollocking!
DAVE: Sorry to here that John. What occured?
JOHN: Well they forced me to close my account or lose my job.....I had to close my account of course 'cos I have a family to feed. I have a lawyer on the case though......we're taking them to court on the grounds of unfair dismyffal.
DAVE: Good luck with that....gotta go.....tell me all about it on Twitter later on!!