Check out these sites

Some of my students told me to check out some of the following sites....I am listing them here, so I do not lose them.
World of Warcraft, Runescape, Moonbase, Marinsworld, Sherwood, Stickman, Mapplestory, Toontown. I am not sure if all of these sites are "social-networking sites...I will try to check some of these out!