Let me offer a counter point of view. LinkedIn knows me and it know my colleagues and my work history. My interactions on LinkedIn are more formal and even mor

Let me offer a counter point of view. LinkedIn knows me and it know my colleagues and my work history. My interactions on LinkedIn are more formal and even more cordial than my interactions on FB or here. If you were a HP/IBM/ any large tech vendor in charge of Financial /banking vertical, you could find me and reach me through LinkedIn and I would hear your pitch, just out of courtesy to my colleague who introduced you. The value of this interaction is what LinkedIn captures. If I were looking for a job at a company, I would be able to get an introduction to someone at that company through my LinkedIn contacts. At FB, everyone seems to be sharing their vacation pictures and hookup/breakup stories. I will guess the CPM on LinkedIn for targeted ads and brand building campaigns would be much more lucrative than on FB. And sales and marketing folks of vendors that sell to businesses would pay for premium membership as well. And so would job seekers.