I've built GifIt (http://gifit.nodejitsu.com/) this week. It allows you to add a gif with your tweets.

It's cool because:

- Gifs are cool

- It uses getUserMedia() to capture the gif from the browser

- Coded in node.js with the MEAN boilerplate (https://github.com/linnovate/mean)

- It's a 15-hours one-person project