A social networking service is a platform to build social networks or social relations among people who, for example, share interests, activities, backgrounds, or real-life connections. A social network service consists of a representation of each user (often a profile), his/her social links, and a variety of additional services. Most social network services are web-based and provide means for users to interact over the Internet, such as e-mail and instant messaging.
Online community services are sometimes considered as a social network service, though in a broader sense, social network service usually means an individual-centered service whereas online community services are group-centered. Social networking sites allow users to share ideas, pictures, posts, activities, events, and interests with people in their network.
Skype, Behance, deviantArt, PayPal, Pinterest, Tumblr, StumbleUpon, Flickr, Digg, Forrst, Dribbble, Viddlr, YouTube, Vimeo, Last.fm, Instagram, LinkedIn, Google, Twitter, Facebook