There are two factors that make your facebook is account being blocked:
1. External factor
There are some reason why your facebook being blocked:
- Maybe in some office or university block facebook network
- maybe your account has been hacked by someone else.
- Maybe facebook user too many add friend into facebook in a day. You should know that there is a limitation of adding friend a day.
- Too much sending or posting link so that this attitude regard as spam either you post a link in wall, message, group or when you are chatting.
- Maybe link or message you write including racism, porn, etc. For example you post or send a link “porn-online.com”.
- Too much poke someone else.
- Copy and paste the writing from copyrighted source.
- Use alias name
- Maybe your age under 18 years old.
- Advertise facebook application in someone else wall.
- Too much participating or joining group in facebook.
- Use uncommon photo use, like porn.