Is PM on Facebook the same as messenger?
There are times when you are using Facebook that you might want to send a message directly to one or more of your friends. This is often known as DM (direct message) or PM (Private Message) as it goes directly to the person (or persons) you address it to and not onto your timeline.
Do you use PM or DM for Facebook?
Consequently, another term you may hear as a substitute for DM is a PM, which stands for private message. PMs originated on Facebook Messenger but are now interchangeable with DMs. The DM term originates from Twitter, but the abbreviation is associated with a host of platforms these days, including Instagram.
