- no "Load More" button on the main feed
- no way to Like a photo without clicking on it first
(if there were an Ajax-y way to comment on a pic without leaving the main feed, that'd be cool too. But the Liking seems more feasible and necessary.)
The reason that's a problem, is that there's no way for me to know for sure if you already liked something or not. I could A) Assume most people are only clicking on the heart to like something and not to unlike something they already liked, or B) Make a request to /media/{id}/likes for every image on the page. Given the two, I think it'd be safe to assume they just want to like something.
Leaving a comment should be pretty simple ;)