LinkedIn serves 90% of us one, and only one purpose - it's an online rolodex that keeps track of where our colleagues are working, and what their current phone

LinkedIn serves 90% of us one, and only one purpose - it's an online rolodex that keeps track of where our colleagues are working, and what their current phone number and email address is. That's it. Bounce around in the valley long enough, and fairly soon you'll have 500+ contacts, and LinkedIn has every one of their email addresses and phone numbers in one spot.