Final answer:
Apple's social media policy stands out due to its emphasis on Brand Advocacy, encouraging employees to use and promote products visibly on social media, which serves as an effective marketing tool.
Step-by-step explanation:
The characteristic that differentiated Apple's social media policy is Brand Advocacy. Unlike other company policies focused on Content Restrictions, Privacy Concerns, or fostering Transparency, Apple encourages employees to use their products publicly and share their experiences. This practice of promoting the brand by its employees helps create a visible loyalty and endorses the utility and desirability of Apple's products to potential customers on social media platforms.
In the context of social media, Brand Advocacy by employees serves as a powerful marketing tool. By urging its employees to discuss and showcase Apple products, the company benefits from the authentic connections and trust that the employees have already established with their followers. This form of promotion also intersects with ethical considerations regarding the disclosure of the relationship between ambassadors and the company they are promoting.