The ANR DataTweet project proposes to explore the idea of a ubiquitous public data service for transmitting short messages in a similar way to Twitter. Any user or source of the service will be able to send a short message at a very low rate to some destination address over various access networks. In a similar way to the water cycle, crowds of devices and mobile users may generate data sent to the Cloud through nearest access points like water evaporating to the sky to form clouds. Collected data become useful information in the cloud, because of all the meaning and interpretation that we can attach to raw data. Then, the cloud can shower the users and devices with the information transmitted in short messages in target areas.