According to numerous sources, Yahoo CEO Marissa Mayer has instituted a HR plan today to require Yahoo employees who work remotely to relocate to company facilities. The move will apparently impact several hundred employees, who must either comply without exception or presumably quit. It impacts workers such as customer service reps, who perhaps work from home or an office in another city where Yahoo does not have one. Many such staffers who wrote me today are angry, because they felt they were initially hired with the assumption that they could work more flexibly. Not so, as it turns out. A Yahoo spokesperson said the company does not comment on internal matters.