[podperson]

This suggests that its userbase is EXACTLY complementary for Facebook.

[shuri]

you are not buying the user, you are buying their attention.

[agsamek]

Not only attention. Also their profile and access to their thoughts which is an asset that big brother is willing to pay for.

In 1984 you needed to hand a copybook to someone you wished to invigilate. Today you invigilate by billions for $40 per head :)