engine - 3:35 pm on Jan 24, 2013 (gmt 0)
Twitter boss Dick Costolo has posted the first video tweet, demonstrating how to make steak tartare in six seconds.
He posted the embedded video using an app from start-up Vine, which Twitter bought last year.
In keeping with the micro-blog's ethos, Vine is designed to enable users to post videos no longer than six seconds.
Twitter Posts Its First Video Tweet [bbc.co.uk]
Here's the tweet