Twitter introduced Vine in January 2013, allowing users to share small snippets of video that were six seconds or less.

Twitter introduced Vine in January 2013, allowing users to share small snippets of video that were six seconds or less, with the app quickly gaining popularity among video bloggers and attracting millions of followers. In late 2016, Twitter announced it would discontinue the app.

Elon Musk announced plans this week to revive Vine, but in "AI form." Here's what we know so far and what people are saying.