Social networking sites are defined as “web sites that allow members to construct a public or semipublic profile and formally articulate their relationship to other users in a way that is visible to anyone who can access their file” (Boyd and Ellison, 2007). Social networking sites allow anyone to have a personal web presence. Characteristics that have made social networking sites so popular include the following:
1. They allow for self-expression.
2. They require little or no knowledge of web design.
3. They allow for social interaction and networking.
4. They are free or inexpensive to use.
The first significant social networking site was classmates.com, founded ...