Sorry 2 The Guy That Replied, But They're Tonns Of Ways 2 Acsess Facebook On A Blocked/Controlled Network. Ofcourse, This Depends If Your IT Boff's A Bigginer Or Can Crash Microsoft.
I Wouldn't Recomended This Anyway, Because Your IP WILL BE LOGGED On The Systems Network, And If They See You Connecting To Facebook Sites, They Will probrably Fire You. :/
But The Idea Is Not Brute Force, But Just Getting Around It.
An Example Is Using A Custom IE Browzer Made In Stuff Like .net(One Of The Reasons Viruses Doesn't Affect It), You Could Get Someone Who Knows How To Programm The Kernel OX(Good Luck With That :P),
Anouther Method That Probrably Works Is Downloading The Intire Facebook Logon Site Using Google Chrome, And Using That To Get Past The Network settings...
So Blocked URL = www.facebook.com
U Loggon With URL On Your Desktop = c:{Other Stuff}facebook.html: Network = OK
Once Logged On It Redirects U To http://www.facebook.com/ref=home : Since URL Not Equals www.facebook.com Network = OK
Now You're In
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This Was Done And I'm Only 13, In You're Face!!!
Oh, Also If You're Using A Wireless Network You Could Probrably Crack It And Log On One With All access.