When my son was little, my mom started collecting his outgrown clothes to give to strangers on the internet. She would meet these people through Buy Nothing, a project that had been created by two women from Bainbridge Island, Washington, not far from her home in Seattle. The mission of Buy Nothing, which had a local cult following, was to revive old-fashioned sharing among neighbors. People were organized by town or neighborhood into Facebook groups, where they could post what they needed, or no longer needed, and their neighbors would respond accordingly.