About Social Networking

i find a definition on wikipedia:
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 e-mail and instant messaging services.
Source: http://en.wikipedia.org/wiki/Social_networking

This is a communication portal for public on the Internet, to share views and information, to group the common interests, to meet friends. We cannot avoid this social networking, we are now using Facebook, MySpace, Twitter, etc, right? We got games, pets, restaurants, farms, topics, blogs, business...! We can meet people of schoolmates, colleagues, boyfriends, girlfriends, also business partners. All parties get benefits. They did successful!