For people who do not care so much about the privacy, you should consider a "simpler" mode. This would also let you work around the network effect: simply send

For people who do not care so much about the privacy, you should consider a "simpler" mode. This would also let you work around the network effect: simply send a text (for people without dataplans but infinite text) or an email with the GPS coordinates + a link to the google map (or OSM, or bing maps..) in one click. Not much data required. Even better: add a "tracking" mode to automatically send the coordinates every minute, as an email reply (to create a thread) which could be useful when you are going to roam the bars and don't want (or won't be sober enough) to update your friends of where to meet. I would also like GPG encoding: again, to work around the network effect, GPG encode the email before sending it. Useful for emailing myself or hacker friends. I would seriously pay for that, especially with the option to run the AGPL backend on my own server (the client should have a field to optionally select another server)