Page 59 PROTECTED CONCERTED ACTIVITY UNDER THE NATIONAL LABOR RELATIONS ACT AND EMPLOYEE USE OF SOCIAL MEDIA: POLICY AND PRACTICE ISSUES FOR EMPLOYERS Gerald E. Calvasina, Southern Utah University Richard V. Calvasina, University of West Florida Eugene J. Calvasina, Southern University ABSTRACT National Labor Relations Board (NLRB) Chairman Mark Gaston Pearce thinks that \"the right to engage in protected concerted activity is one of the best kept secrets of the National Labor Relations Act\