Facebook has introduced a new tool for its Workplace platform that allows employers to suppress certain words, including 'unionize', from trending in workplace chat. The feature has sparked controversy, with some Facebook employees denouncing it and the company later apologizing for the example used in the presentation. The tool is part of Facebook's efforts to provide content control to employers, but it raises concerns about labor organizing and freedom of speech. Facebook has stated that the example was poorly chosen and the feature is not intended to be used for suppressing unionization discussions.