See also "Social Networking Sites" in the Quick Reference section of Webopedia.

Webopedia Quick Reference: Social Networking Sites
When people talk about a computer network they generally are referring to a group of computer systems linked together. Within the network each computer system or device is called a node. The idea behind a social network is similar, only the nodes are generally individuals, groups or organizations.

Webopedia's "Did You Know...?" Section
Use this Webopedia knowledge section for an in-depth overview of specific technologies and occurrences in the areas of Computer Science, The Internet, and Computer Hardware and Software.