Popular Photos works by algorithmically selecting photos from friends, and looks like this:
Normally, when a user taps on a photo and scrolls or swipes, they will be taken back to where they came from (e.g. newsfeed or profile timeline). With Popular Photos, scrolling down will show more friend-uploaded and public photos.
Popular Photos will also truncate captions after roughly 65, making the stream appear streamlined. Users can still tap on "See More" to see the entire caption.
What do you think?