The images. It's ridiculous to have a 8MB size limit but then resize images to essentially thumbnail size. If the concern is visibility there can at least be an option to download the originals.
Then the groups could also have been separate from stories and not start with an "I". Just because people join groups doesn't mean they want to apply them personally. This was one of the major criticisms of experienceproject of people that didn't know. Just because this site is a continuation doesn't mean it should copy everything exactly. That's not how social media grows. This is something that Applies To Me got right a lot better.