Tabulas has been hacked!

I was trying to visit one of my friend's blog but i saw this message instead..

One of the servers has been hacked. There is no reason to believe right now that any of your data has been lost. I am working right now to bring Tabulas back up. I apologize for this downtime and will post a full explanation once everything is back.

-Roy

Questions: Who hacked tabulas? What's the reason behind this? When was it happen?