I know that this problem exists. I replied to Soulfuldreamer on the same theme. The interfaces I use to interact don't show me many notifications, and I think the same is for many other people. Maybe there are some thresholds in the programming of the apps to report only notifications they consider valuable. I don't know, precisely.
I didn't find any solution and the only way at the moment is to manually check the #photochain tag or my blog. I continue to tag the participants, anyway. We'll see what the future take us.