Twitter, now known as X, used a short bird-like chirp as its default mobile notification for mentions, messages and alerts, tying the sound to its bird logo and brand identity. As the platform grew in the 2010s, the chime became one of the most recognized app sounds in the world, often imitated in comedy sketches about phone addiction. Even after the rebrand, creators keep using the classic chirp in edits because viewers instantly understand it means new information has arrived.