So as we are now on Mastodon, I wanted to do things properly and add a "Share on Mastodon" link on news articles (which is a bit harder than with centralized networks as people need to specify their instance).
Screencast below is how it looks right now (on testing website only for now).
Code for people needing to do something similar: https://gitlab.gnome.org/Infrastructure/gimp-web/-/commit/1f52d2279ee8edd37795e2aeeef28efdfdf824f5