Ok so at my school someone hacked my teacher's schoology account, and i need to find the culprit?

schoology is a website like facebook where teachers post things such as homework projects and even tests. Recently my english teacher's account was hacked and had been getting really pissy about it. Today they posted on his account "Call me Daddy" so he said whoever finds the culprit will get extra credit (a whole letter grade). So i was wondering if there were anyway i could find the culprit so i can get the extra credit. Our school is an ipad so every student and teacher has an ipad. If you need anymore details just ask.

Read more: Ok so at my school someone hacked my teacher's schoology account, and i need to find the culprit?