The concept of an adaptive enterprise is far from a new one. Stephen Haeckal first wrote about it back in the late 90's. The reason why it hasn't really taken off is that there is still a huge tendency to worry purely about the technology or the tools.
Ford and GM didn't manage to compete with Toyota by borrowing the tools of the TPS, they only managed to compete when they started a root and branch reform of their cultures (you could say GM still isn't there).
It's no different with social. Think of the environment most employees work in. Pay is based upon individual achievement. Measurements are based upon individual achievement. Jobs are often done according to job descriptions prescribing individual behaviours. Decisions are typically made according to hierarchy rather than knowledge. Information is seldom available in a transparent manner, and feedback is often far from abundant.
Given such an environment, why would installing an enterprise social network make employees social?