It is one kind of marketing which is connected with different people. It is basically an online connection where one person is connected to other and the other person is connected to some other in many forms in many relations in many terms like from the way of friendship till the way of partnership the people are connected in orkut, facebook, LinkedIn, twitter etc. they share their kn... https://www.expertsmind.com/marketing/social-networking-source-of-marketing-help.aspx