This short notification tone comes from Facebook's messaging interface, where similar pop and bubble sounds accompany incoming messages and alerts. As Facebook and Messenger became some of the most-used apps in the world, their interface sounds seeped into everyday life, turning up as phone ringtones, parody sounds and meme audio. Creators now use the clip as instant shorthand for any incoming message, regardless of the app shown on screen. Its usefulness comes from pure recognition rather than novelty, and it still circulates in text-message memes and notification compilations.