The "category" column shows the type of directory source. There are 6 available categories:
- Directory: an online listing directory
- Map: sites that have an online map like MapQuest or Google Maps
- Social: social media networks like Facebook or Instagram
- Aggregator: publishers that push their listing information to other listing sources
- App: standalone applications like Snapchat that are not GPS services
- GPS: sources that power GPS applications like those found in cars