I see a handful of parallels between Tumblr, Twitter, and Instagram--aside from the ability to re-post, of course--so I'm surprised how little work Instagram has put into content discovery.
Aside from the initial load Instagram's explore feature, its difficult to see what images are trending, and hard to organically search photos tagged at a given location unless you navigate to a photo tagged with that given location first.
Aside from the initial load Instagram's explore feature, its difficult to see what images are trending, and hard to organically search photos tagged at a given location unless you navigate to a photo tagged with that given location first.