Pretty much everything fun, only in middle school everyone found a different URL that takes you to facebook that wasn't blocked and they went on that way. Eventually that became blocked, too. There's also a game website called spindow that didn't used to be blocked in the middle school, but eventually they blocked that too, as well as addicting games.com.
At my high school, however, spindow isn't blocked. Our grade pretty much discovered it, so they haven't found out about it yet.