As part of a self-initiated project, when Snapchat was at its peak in 2016, I created a series of geolocation filters for different historical cities around the UK. Geofilters can be users as overlays for snaps when they are within the geo-fence, which is defined as the edge of the city. 

The filter for York received a commendation from Snapchat as an outstanding filter and was featured by Snapchat on their website for several months in 2017.