One cool implementation of Mastodon-as-comments was with the G-Droid frontend app for the F-Droid ecosystem. F-Droid apps don't have comments or ratings on the

One cool implementation of Mastodon-as-comments was with the G-Droid frontend app for the F-Droid ecosystem. F-Droid apps don't have comments or ratings on the default F-Droid app. They're generally less necessary because the apps don't have ads or severe privacy concerns like the ones from Play Store do, but it's still nice to hear others' experiences and comments on them. G-Droid introduced a commenting system by simply redirecting you to a mastodon URL when you clicked "Add a comment". That URL will by default add "@gdroid@mastodon.technology" and a hashtag based on the app package name to your post. For eg., for the Markor app, it would add @gdroid@mastodon.technology #net_gsantner_markor #fdroid_app_comments at the end of your comment post. The @username will notify a bot to pickup this comment, the hashtag will help it attribute it to the right app, and so your comment will get collected and displayed below the app listing in G-Droid. Sadly, G-Droid itself doesn't seem to be actively maintained anymore, the last update being a few years old, but it's a really cool example of what is possible when you have open, flexible systems that can be plugged in together in many ways to create the features you need.