I think this is easy to implement and with increasing importance. It's simple: let users share easily screenshots photos from games in vertical format.

When you try to share verticual screenshots they shrinks and fit in a horizontal canvas and it's cool how it looks.

I have seen users uploading with success screenshots in vertical format but the process is very complicated and unintuitive. I myself couldn't do it.

In a gaming industry where Virtual Photography has increased importance not only for users with artistic will but for the marketing for gaming companies, I think it's important to improve the implementation of photo mode and sharing shots.