[Who’sAround? -- way to send messages to only to people nearby you without them having to make their location public. Say I want to go boogie boarding with my friends in San Diego -- I send out an email/fb post to friends, with the filter currently in San Diego added. Then, only my friends whose GPS/IPs indicate that they're currently in SD get the message.  It's not creepy/a waste of power (*cough* Daniel *cough*) like constantly geotracking people, and yet is in many ways a "gateway" into that world. This RELATES TO Doug's "Bam" app that allows you to post "e-graffiti", digital messages tagged to a location. (This recreates the real-world phenomenon of being able to yell out and get the attention of only people near you -- in my mind the replication/generalization of real world phenomena in the digital world is a powerful heuristic #replicatesrealworld). RELATES TO CommonPlace, "social networking for the neighborhood"  https://www.ourcommonplace.com/about](https://www.ourcommonplace.com/about) #lowhanging  ~jcole@mit.edu