A social network is a social structure made up of individuals called "nodes", which are tied by one or more specific types of interdependency, such as friendship, kinship, common interest, financial exchange, dislike, sexual relationships, or relationships of beliefs, knowledge or prestige.
Social Networks are groups of people who share interests and who interact in a variety of ways via software on websites. These include file-sharing, chatting, messaging, exchanging photos/video etc. Social network sites are usually free to join. Include Myspace,Facebook,Bebo,Orkut,LinkedIn and so on.
We define social network sites as web-based services that allow individuals to construct a public or semi-public profile within a bounded system, articulate a list of other users with whom they share a connection, and view and traverse their list of connections and those made by others within the system. The nature and nomenclature of these connections may vary from site to site.
The Importance of Social Networking：Social networking can help a business gain contacts, clients, and increased public awareness.Even entrepreneurs who run small businesses from their homes can take advantage of this resource to set up a global presence.
To make the most of social networking, it's important to fully understand the concept of social networking and how it can be applied in ways that will help you grow your business.
Social networking is making its mark in history these days. In fact, it is progressing so fast, it is leaving the news media in the dust. Everyday people are reporting news faster than a whole news team.
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社交網路是一種社會結構由個人組成的，稱為“節點”，它是由一個或多個相互依存的具體類型並列，比如友情，親情，共同的利益，金融交易，厭惡，性關係，或關係的信念、知識或聲望。
社交網路是一群通過軟體在網站上分享興趣和互動的人。這些包括檔案共享，聊天，訊息，交換照片/視頻等社交網站通常免費加入。包括聚友網、臉譜網、桑塔納，Orkut，LinkedIn等等。
我們定義了社交網站為網路服務，允許個人在一個固定的系統構建公共或半公共的輪廓，清晰的列表中的其他用戶和他們共享一個連線，並查看和線連線和其他系統內的列表。這些連線的性質和名稱可能會有所不同，從現場到現場。
社交網路的重要性：社交網路可以幫助企業獲得聯繫，客戶，並提高公眾意識，即使企業家誰經營小企業從他們的家可以利用這個資源，建立一個全球性的存在。
要充分利用社交網路，重要的是要充分了解社交網路的概念，以及如何將它套用於幫助你發展業務的方式。
社交網路正成為歷史上的標誌。事實上，它進展如此之快，正將新聞媒體留在塵埃中。每天人們報導新聞的速度比整個新聞組快。