Students love to share with each other and others from outside of the class.
Allowing students to communicate and or chat during class or outside of class will open up the lines of communication between you and your students.
Many of these resources allow for monitored chat rooms, quick webcam communications, and more.
"Unleash the Guru" was a job for The Guru in Rumble Down Under of Sly 3: Honor Among Thieves.
As Bentley, go to the stockade and bring the Guru's gear. As the Guru, wait for a guard to come, then hold down to possess the guard and ram the cage. After cutscene, possess guards to ram into and destroy four drills. Bentley will tell you that the linked generator to a grinder can easily be destroyed.
I will put some sites here that may overlap into other areas, but for the most part they are networking sites.