It would be great if we could track our feedback to articles in addition to our ideas and likes so that a) we can know what we have already commented on and b) if the article did receive an update based on our feedback that we were somehow notified about it.
I believe this will be fixed when the community is migrated to the new platform in April. We should see lots of improvements in terms of re-surfacing older discussions, subscribing, liking, notifications, etc.
We have a lot of exciting changes coming soon...and you will be able to keep better track of your content. Feedback of articles will be different, but you will be able to see all of your published content in your profile!