Ask Slashdot: Can companies force employees to join social networks?

rubeon writes: "Companies can get a lot of mileage out of social networking services from the likes of Google or Facebook. Chat, document collaboration, and video conferencing using services like Google+ Hangouts or Facebook's Skype are seductive additions to an IT arsenal. But a lot of people have privacy concerns about these services, and there's no shortage of horror stories how these sites track and exploit their users' habits. Can a company force its employees to use Google+?"