"... Switzerland's Pumpipumpe is trying to bring a little of that back -- forward? -- into the information age. Rather than developing a mobile app that assists sharing of goods between neighbors, they've gone old-school with stickers that people can apply to their mailboxes to let others know what they have to lend. It's a simple ploy to encourage more social interaction and sharing between neighbors who are interested in lending and borrowing things within their local community."
Something that cohousing groups may want to adopt!