I'm still a believer in the promise of Web 2.0. The idea that giving people a curated space to chat produces tiny sparks of magic. My wife Liz and I have been running the OpenBenches project for about 8 years - it's a crowd-sourced repository of memorial benches. People take a geotagged photo of a bench's plaque, upload it to our site, and we share it with the world. Might sound a bit niche,…