How’s this for counter-intuitive? Social technologies — the software and services that make it possible to show off your vacation pictures to all your Facebook friends and follow your favorite team tweet by tweet — are not just giant time sinks that keep your employees from getting their work done. On the contrary, they may become the most powerful tools yet developed to raise the productivity of high-skill knowledge workers — the kind of workers who help drive innovation and growth, and who are going to be in increasingly short supply.