In summary... (deja vu)
1. Were back !!
2. I restored to the backup at 3.20am AEST today
3. Many sites have been hacked, it was due to a 3rd party add-on that is very common. The add-on has been fixed.
You need to re-vote and/or re-enter competitions, also re-post anything from this morning.
Technical: It was an SQL injection attack (bug in the add-on product) that created a new Admin user, and went downhill from there.