Using social media as a student and teacher

I would use social media as a student by searching for certain problems I have in a class. Maybe I need help with math, so I can search for certain things on twitter for math that could help me. I could also tweet out to other students, to see if they could help me with my problems. As a teacher I would post certain things that are optional for students. Such as bonus problems on twitter or facebook. Possibly use it as a place for students to send me messages about how class is going for them. I would also post motivational things for students to look at, to keep them motivated about school.