The 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: open 802.11 hotspots, base stations of LTE, car-to-infrastructure stations of 802.11p. The user or a device sends its message to the nearest wireless network at hand (for instance a 802.11 hotspot) that will forward it in a multihop way to the destination by the elements of the infrastructure network.