Pebble (formerly T2) was an American social media platform founded by former Twitter employees Sarah Oh and Gabor Cselle.

[1][2][3] It provided an authenticated network where users could make posts and interact in communities before shutting down on 1 November 2023.

[13][14] In early 2023, T2 hired former Discord Senior Director of Engineering Michael Greer as its chief technology officer.

[17] Pebble was one of several social media platforms conceived as an alternative to X (formerly Twitter) after its takeover by Elon Musk.

[11][18] Pebble's moderation was planned to make use of both human review and artificial intelligence features.