WhatWhat is a free social and communication app developed by Florent Champigny for Android devices. It allows users to sign in using their Google+ or Facebook account to invite friends and see in real-time what they are doing. With WhatWhat, you can know what your friends are doing and let them follow your activities.

One of the unique features of WhatWhat is that it is a real-time social network, which means that you can see what your friends are doing as they do it. If you have not heard from your friends in a while, you can send them a "WhatWhat are you doing!?" message to see what they are up to. The app is designed to be engaging, and the developers are counting on users to provide feedback to help them improve it.

Overall, WhatWhat is a great app for those who want to stay connected with their friends and know what they are doing in real-time. It is easy to use, and the developers are constantly improving it.