If you don't know, Movie/Game submissions update a RSS feed associated with your account. It's that little "broadcast" symbol on their pods!
You can grab the link from it to use in all sorts of readers, like extension-based ones in your web browser or phone programs. The idea is the reader can periodically check these to deliver you the latest news without having to be worried about if you're missing out on something.
Podcasts famously still use these, and RSS in general is seeing a resurgence in interest following growing discontentment with social media and yearning for healthier ways of interacting with the World Wide Web.
Feedbro extension running on Librewolf, showing a feed from artist David Revoy's website.
The issue I've had however is that Newgrounds doesn't create a feed for art, and I had to rely on RSS Bridge to make some for a few artists. (RSS Bridge can also make feeds for all other sorts of sites.) If one were to be officially implemented, it could probably point to "http://rss.ngfiles.com/users/7149000/unevenprankster/art/", slap the RSS icon on the art pod and make me a happy man.
Anonymous-Frog
Newgrounds posts 5 RSS feeds: The site news (usually posted by @TomFulp), the Daily Top 5 and Weekly Top 10 (for movies + games), and "Latest Submissions" also movies + games. Audio also has their own top 5 for the week.
Art could probably have its own feed too, though which submissions to add might be a problem.
https://www.newgrounds.com/wiki/help-information/rss
UnevenPrankster
I mainly just want individual artist feeds, latest art feed could be cool but like you said, tricky to decide what