Student Forums
GlobalSpec is a student forum by IEEE chapter which includes active discussions on a lot of engineering subjects.
StackOverflow is an popular education forum topics ranging from programming laguagues to engineering QA discussions.
Student Doctor is a non-profit student forum for medical students with engaging discussions from medical colleges data to Resident options and more.
If you are science student majoring in physics, Physics Forum is the place for you. The active discussions include basic physics concepts to research topics.
If you are an art or science student or a fan of Do it yourself(DIY) projects, Instructables will be a fascinating place for you. Many active participants showcase their DIY projects and engage in discussions.
College Confidential is an active student forum with engaging discussions from college admissions to research.