Facebook and other social media at work

HR professionals are discovering the value of using Facebook, Linked In, and other social media for recruiting. Other areas in organizations such as sales have started including social media in their public relations, marketing, and sales activities.  Organizations can also have Facebook or Facebook-like social media behind their firewall so it's only accessible for company employees. What role do you believe social media should have for employees' internal communications?  

Is the use of social media at work an employee's right? 

Is the use of social media when off work an employee's right?  Refer to the rights described in Chapter 15.    Make sure it is at least 250 words and APA style Thanks