Why can't you get into Facebook?

We here at AMHD cannot help you get around any sort of administrative restrictions imposed on a School, Work, or any other network not owned and operated by yourself. These restrictions can include (but are not limited to): Website Blocking policies, Software Installation policies, Email retention policies, Software Configuration policies, Network/Internet usage policies, Network Configuration policies, Forum or Chat Room Bans, Game Server Bans, or any other actions that are deemed "unauthorized" by the owners/administrators of the network in question. Any actions by members of AMHD that would be offered to help in this manner would directly violate the site's TOS

Most networks that block sites also ban the use of proxy services to get around the blocks through their User agreement, this is the case with the networks I manage so if you use a proxy to circumvent security you have violated policy and thus are subject to any punishment prescribed in policy, in short use a proxy and you could be disciplined according to the policy. Network security is serious stuff for organizations, that protects their data and business operations so violating policy can and should be viewed as a serious offense.use Facebook on your own time on your own connection.
Though the primary concern with Facebook is lost productivity it is still possible for dangerous code to be served from sites like Facebook that allow others to post content or to use any coding including HTML ot other markup scripting.