In the "stream" section, it only shows your follower's activities. If you want to see if people have commented on your stuff, look to the top left of the page and find "notifications." Notifications will show you if people have replied or commented to you. This new feature makes it much easier to see comment activity.
And if that isn't enough, they brought skills to a new level where you can now "master" a skill. To master a skill you must complete six challenges. They've also made some major updates on the DIY app!
We're expecting even more updates to come out very soon! We'll keep you posted. Have fun on DIY with these new updates!