Make Collections more presentable. Improve Mobile (non-app) experience.
Love the Collections page and I think it should be more upfront with the albums instead of hidden in the background. Also, there is no shortcut to share a Collection. It seems like such a great feature is being neglected! It didn't even get an upgrade when Flickr redid the album pages. Please give Collections and updated look and also add it to the forefront! The feature is also neglected in the Mobile app and needs to be brought in there.
While I'm at it, the mobile experience for non-app users needs an overhaul. The interface is terrible when using a mobile browser. Not all my friends use the Flickr app, so when they go to look, it is a pretty terrible experience. Please update the mobile (non-app) experience!
More specifically on Collections - The page when you click into a Collection needs a major update. I think it is still stuck in the old Flickr design from years ago!