Instagram definitely runs on PostgreSQL. Here is official Instagram engineering blog mentioning the same: https://instagram-engineering.com/what-powers-instagra

Instagram definitely runs on PostgreSQL. Here is official Instagram engineering blog mentioning the same: https://instagram-engineering.com/what-powers-instagram-hundreds-of-instances-dozens-of-technologies-adf2e22da2ad https://instagram-engineering.com/what-powers-instagram-hund... > Most of our data (users, photo metadata, tags, etc) lives in PostgreSQL; we’ve previously written about how we shard across our different Postgres instances Another relatively big company that uses PostgreSQL is Gitlab.