Tinder is very good example of Database Sharding Pattern.

▪ Tinder allows to match and meet other people who use the application near you (around 160km) based on location.

▪ To find people near you very quickly and offer choices that meet the criteria what you set.

▪ How Tinder match peoples who are near to each other ?

▪ Tinder segments users based on their location.

▪ This is called GeoSharding, that is, location-based database sharding.

▪ Sharding by dividing the world map into boxes with their locations and matches them in only into that box locations in the world. 

https://medium.com/system-design-concepts/dating-application-system-design-aae411412267