Source: YouTube user TheEllenShow 
It's finally happened. Twitter may have banned animated profile pictures, but the company has just unleashed animated GIFs in tweets. Posting a tweet with a GIF is as straightforward as posting a tweet without a GIF.
Step 1: Compose your tweet as normal.
Add the GIF where you'd typically add a photo.
Step 2: Publish and repeat.
To avoid annoying the crap out of others, Twitter has disabled autoplay for GIFs. Users will have to press a play button to enable the looping animation.
Now, with power comes great GIF responsibility. Don't over-GIF, unless you're The Ministry of GIFs . Carry on.
O_O » GIFs in tweets. http://t.co/CFSOqU5sHh 
— POPSUGAR Tech (@POPSUGARTech) June 19, 2014 
Source: Tumblr user The Curious Stranger