Stack Overflow recently launched an Instagram account:
This morning, we launched an Instagram account. We’ve had accounts on Twitter, Facebook, LinkedIn, and Youtube for a while, but never Instagram. We felt it would be fun to join this visual medium where we could highlight great contributions from our community.
https://stackoverflow.blog/2020/03/27/stack-overflow-instagram-account/
However there is no Instagram link at the bottom of each site, as there are for the other Stack Exchange social media accounts: