Too Long; Didn't Read
YikYak was an anonymous social network that used your location to show you posts 5km around you. Users of the app could create new posts and the people around them could view the posts and vote up or down. Postgres enables users to incrementally add features that help us do new things with our data. The Postgres database enables us to make use of this data-structure via geospatial extensions. We can now use these built in functions from those extensions to show us the two nearby posts.