AirDrop

 AirDrop  is a UX on Apple modern iOS and MacOS devices that allows users to share pictures, notes, contacts, and link directly with each other in-room, independent of any centralized service or silo, an example of a distributed ideal.

Brainstorming

 * Imagine if a stranger at an IndieWebCamp could open up something like AirDrop and find within the room people who had openly available h-cards or other interesting information (hobbies, jobs, etc.) to peruse.