“In general, what employees do in their own time is their choice, but Apple states in its guides that:
The lines between public and private, and personal and professional are blurred in online social networks. Respect your audience and your co-workers. This includes not only the obvious (no ethnic slurs, personal insults, obscenity, etc.) but also topics that may be considered offensive or inflammatory. In sum, use your best judgment.
It is unlikely a rant or two would cause deep damage to the Apple image, but without online restriction the brand could lose that sense of professionalism that inspires so many.”