Search "Facebook notification pop sound MP3" on Zedge or SoundBible. The file size is typically under 100KB.

The "pop" sound has occasionally been at the center of technical glitches. In early 2024, many iPhone users reported a strange "chirping" sound while browsing the app. Meta confirmed this was a technical error rather than a new feature. Facebook Pop ringtone by _GiGiMON_ - Download on ZEDGE

If you want to enable or disable the "pop" sound that occurs you are using the app: Facebook App (three lines) > Settings & Privacy Sounds in the app on or off. GarageBand to set a custom notification sound on an How To Change Facebook Messenger Notification Sound

You can find the original Facebook "pop" and its variations on the following platforms: : Offers the Facebook Pop Ringtone for mobile devices.