A social network service focuses on building online communities of people who share interests and/or activities, or who are interested in exploring the interests and activities of others. Most social network services are web based and provide a variety of ways for users to interact, such as email and instant messanging services.Example of the SOCIAL NETWORK SERVICES are the SKYROCK is a social networking siteoffering its members a free, personal web space where they can create a blog, add a profile, and exchange messages with other registered members. The site also offers a specific space for members who create blogs showcasing their original musical compositions

Skyrock ranks as the world’s 7th largest social network with over 21 million visitors in June 2008

Skyrock.com began as a blogging site, Skyblog.com, founded by Skyrock CEO Pierre Bellanger in December 2002,next is the MY CHURCH is a Christian social network which was launched on September 6, 2006. It offers a social network service for Christian churches that follow the Nicene Creed, with features modeled after those found in MySpace and Facebook. In addition to standard services offered by social networking websites, MyChurch allows churches to post sermon podcasts, have event calendars, and collect tithes from members (for a service fee of $12 per month).MyChurch's revenue comes from advertising and a premium subscription business model and has a presence of over 6900 churches. MyChurch has been compared to other Christian websites such as GodTube and Conservapedia. MyChurch encourages non-Christians to join while actively excluding Christian Churches that do not subscribe to the Nicene Creed.The last one is the very famous social network services,the FACEBOOK.Facebook formerly Thefacebook, is a free-access social networking website that is operated and privately owned by Facebook, Inc.Users can join networks organized by city, workplace, school, and region to connect and interact with other people. People can also add friends and send them messages, and update their personal profiles to notify friends about themselves. The website's name refers to the paper facebooks depicting members of a campus US colleges and preparatory school give to incoming students, faculty, and staff as a way to get to know other people on campus.

THE SOCIAL NETWORK SERVICE is said to be a good and friendly social networking because it allow us to connect and to interact with other people, giving them access to our friends profiles. Users also can create profiles including photos and lists of personal interests, exchange private or public messages, and join groups of friends.The social network can enterain us like different games,for example in the facebook,there is the farmtown.