Some valuable points made in this article - including issues related to social identities ("multiple 'selves'"), social structures and structural holes (attempts to segment relationships), and role conflicts.
Available All the Time: Etiquette for the Social Networking Age - Knowledge@Wharton
After a long day at the office, imagine logging onto Facebook to see what your friends have been up to, only to have your boss or colleague message you about an urgent work matter. Aside from the fact that you are officially off duty, is it appropriate for your co-worker to reach out to you through a social networking forum? Was it wise to accept a colleague or higher-up as a "friend" to begin with? And -- perhaps more importantly -- in this day and age, when people are seemingly available around the clock because of smartphones and our endless appetite for all things online, is anyone ever really "off duty?"
As Facebook, Twitter and 24-hour Blackberry access blur the lines between business and personal lives, managers and employees are struggling to develop new social norms to guide them through the ongoing evolution of communications technology. Wharton faculty and other experts say the process of creating rules to cope with the ever-expanding reach of modern communications has just begun, but will be shaped largely by individuals and organizations, not top-down decrees from a digital Emily Post. Generational differences in the approach to openness on the Internet will also be a factor in coming to common understandings of how and when it is appropriate to contact colleagues, superiors or clients.