Following are the most popular social networking sites on the Web along with many innovators (in alphabetical order). There are many more, and sites emerge and wither away all the time.

Many law enforcement agencies use social networks as a tool to gather evidence As with all new technologies, online social networks come with good and bad reviews from law officers and courts.

Several groups have developed electronic networking systems, often with added social functionality. Each site has its own features and functionality, as well as a slightly different population and ...