1) A social network is a social structure made up of individuals (or organizations) called "nodes", which are tied (connected) 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.
2) facebook, twitter, myspace,yahoo, blogspot,msn, youtube, skype.
3)to share time with friends and comunication with them.
4)yes, facebook, twitter, myspace,yahoo, blogspot,msn, youtube.
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