Our school blocks everything they can. There are a select few sites that aren't blocked, but they have all the sites blocked except what they approve, but there are a few that somehow slip through. A couple lesser populated forum sites and such.
The Lex was blocked under forum/entertainment/recreation until we got new computers and they re-programmed smartfilter. If you type in twilightlexiconforum.com or twilightlexicon.com it will be blocked, but the new forum.twilightlexicon.com is not blocked, I guess because the computer didn't notice when the new URL was added.