The phrase indicates a request for someone to send a private message to the user on the Facebook platform. It is an invitation to initiate a direct, one-on-one conversation within the messaging system of Facebook. For example, if someone asks for more details about an event, they might be told to use Facebook’s messaging feature for a more detailed explanation.
The use of this phrase facilitates communication beyond public posts and comments. It allows for the exchange of sensitive information, private discussions, and personalized assistance without involving the wider audience of the social media platform. Its prevalence reflects the integration of social media into everyday communication and the reliance on these platforms for both personal and professional interactions since Facebook became the dominant social media platform.