A social networking service (also social networking site, SNS or social media) is an online platform that people use to build social networks or social relations with other people who share similar personal or career interests, activities, backgrounds or real-life connections.
The variety of stand-alone and built-in social networking services currently available online introduces challenges of definition; however, some common features exist: (such as former school-year or classmates), means to connect with friends (usually with self-description pages), and a recommendation system linked to trust.
In some cases when the news story is more political, users may be more likely to voice their opinion on a linked Facebook story with a comment or like, while Twitter users will just follow the sites feed and/ or retweet the article.New social networking methods were developed by the end of the 1990s, and many sites began to develop more advanced features for users to find and manage friends. However, thanks to the nation's high Internet penetration rate, the first mass social networking site was the South Korean service, Cyworld, launched as a blog-based site in 1999 and social networking features added in 2001.Friendster was followed by My Space and Linked In a year later, and eventually Bebo.Many prototypical features of social networking sites were also present in online services such as America Online, Prodigy, Compu Serve, Chat Net, and The WELL. Many of these early communities focused on bringing people together to interact with each other through chat rooms, and encouraged users to share personal information and ideas via personal webpages by providing easy-to-use publishing tools and free or inexpensive webspace.Some communities – such as – took a different approach by simply having people link to each other via email addresses. In the late 1990s, user profiles became a central feature of social networking sites, allowing users to compile lists of "friends" and search for other users with similar interests.