Facebook Errors on multiple browsers?

[Gwazi]

Basically I'm getting three main issues with facebook that have lasted a few days now so I'm wondering how to fix them.

1. On Google Chrome every time I try to post a comment it never does through and keeps giving me the "Unable to post comment. Try Again" message.

2. On Firefox facebook simply didn't run period claiming it was 'updating the site'

3. When I try to log on other sites through facebook (On chrome, not tested on firefox) it simply gives me an error message claiming it can't connect to facebook.

Has anyone else ever had this issues and know how to fix them?
@Facebook has been blocked: I relise the one who first said this probably won't see this and reply. But this is for others who may answer. How could I tell if it's been blocked from my computer or not? It's my home PC so it's not like it's a school trying to block it or anything.

Also, how could I unblock it or why would facebook of been blocked on my computer to begin with?
On more attempts to fix it I found it it's blocking comments, status posting and chat messages I send out. I still receive everything from others, I just can't reply.

[Munna]

facebook.com has been blocked from your computer