> What lock in? There is no friction in typing in a different website's address.

The fact that all your photos, content and friends are on one platform and not the others, obviously.

That you chose to put there, on someone else’s computer. Other than you and your friends’ and family’s willingness to do work, there is no lock in, and I don’t believe that’s a useful way to define lock in.

So the fact that in the 90s you put your sentences into Microsoft's proprietary .doc format, or that you decided to run your business on Microsoft Windows computers is not lock-in either? What definition of lock-in would you propose that would include the above which is widely regarded as lock-in, but exclude FB as lock-in?

The utility of the forum comes from other people. Social graph is absolutely a means of lock-in, and it's long overdue for us to recognize that.