What telecommuting employees do during business hours while they're working from home apparently isn't all work, but that may not matter all that much, according to this recent article reporting on a study of such employees:

What People Really Do When They're 'Working From Home' by Vanessa Wong, BusinessWeek, June 25, 2012

New NLRB Poster Requirement for All Employers

Effective April 30, 2012, all employers must add one more workplace poster to their existing workplace postings: a National Labor Relations Board (NLRB) poster regarding employees' rights to organize and bargain collectively.