iNaturalist is a great example of a citizen science tool with built in accuracy parameters. Using a smartphone, participants make a photographic "observation" of a species — plant, bird, mammal, bug — and using the phone's global positioning software, iNaturalist assigns the photo a date, a time, a latitude and a longitude. So right there, we know exactly where that species was observed. iNaturalist streams people's nature observations like Facebook does, and experts from around the world confirm or correct a species designation. And if you have no idea what the species name is for the thing you observed, they fill that in. When three experts agree, yes, that is a Deppya splendens, the observation becomes "museum grade" and is uploaded to the Global Bioinformatic Data Facility (GBIF), which is used by scientists all over the world.