
The Fort Morgan fire roared through Mount Diablo State Park in Clayton, Calif., on Sept. 8, 2013, leaving behind a charred landscape.
But as fire is part of a natural ecosystem, plants and animals have begun to return to the once-blackened land.

To document the recovery, the group Nerds For Nature came up with a brilliant use of Twitter hashtags. Visitors to the state park can set their phones in one of four holders near signs explaining the project to take a pre-framed photo. They then send the photo to Twitter or Instagram with a hashtag linked to the location. It is then automatically collected and archived, searchable by hashtag.
