Facebook uses the "Off Facebook Activity" feature, a feature that began to be implemented the previous year, and is the most used application in the "historical" world.
The feature allows you to manage the information Facebook collects from you for using their sites and applications.
This simply shows that Facebook is stalking you, either through messenger, or its sister’s apps. Facebook knows a lot about you without you knowing.
The “Off-Facebook Activity” tracker will show you 180 days’ worth of the data Facebook collects about you from the many organizations and advertisers in cahoots with it.