How does one effectively communicate with a large number of strangers in close proximity? It could be the 'Annual Balloon Festival' in your locality, a conference, local emergency, an event at a stadium or your college campus. Of course you could use noisy megaphones, crowded information booths or resort to Twitter (for which you are back to the problem definition, how do you disseminate which twitter feed to subscribe to?). Enter SwarmLocal.
SwarmLocal lets you build localized messaging HotSpots (a.k.a swarms). The swarms you create or subscribe to have range limits, only users within the range can subscribe. Best of all, the swarm you create can be mobile, it moves with the Host who created it. Swarms disappear when user membership drops to zero. Also users automatically lose membership in the swarm when they move out of range.
Information stays local and users anonymous. Like a radio station, you tune in and tune out when out of range or flip to a different channel.