PSID is the page range ID of each user in the audience that Facebook uses to process different communication channels.
Companies usually use multiple channels to communicate with customers, such as websites, mobile apps, and Messenger. When someone interacts with a company through Messenger, an ID is created for a specific page associated with the robot in Messenger, called a page scope ID.
You can find the PSID in each user’s profile in the "Audiences" tab:
You can download the PSID of all users as a .csv file here:
Please note that you will need to subscribe to PRO. The downloaded list will only contain PSID and nothing more. This list can be inserted into, for example, Facebook Ads Manager during targeting setup. Ads Manager will recognize them and you can create custom audiences from subscribers.
