Overview/Description A social networking service is an online service used to build networks of people often with a common interest or goal. The networks reflect networks of people in the real world. Typically each user has a representation in the form of a profile, and the service allows interaction in the form of messaging, and typically some way to share events, activities, and content, possibly in the form of digital photos, videos or web links. The big international social network providers are Facebook for personal social networking, Twitter, which is described as a micro-blogging...