Instago – the easiest way to explore photos at any location

* The "I want to explore..." box doesn't really scream SEARCH BOX at me. My first instinct was that it was a kind of "I'm Feeling Lucky" button. You might be able to make it a little 'searchier' just by getting rid of the all caps and left-aligning the text.

* Scrolling through the Places menu is pretty laggy (on my iPhone 4S, at least), especially when compared to scrolling through photos, which is lightning fast.

* I love the pleasantness of the copy/messaging in the app. When it prompted me to share, I couldn't help but tweet it. One thing you might consider doing for that menu in particular is making it a two-step thing instead of a three-step thing. Right now, you ask the user if they'd like to share, then which network they'd like to share with, then they have to do the actual sharing. Why not unify that first and second step into a single prompt?

* In the pane in which the I Want To Explore box has focus, the spacing/balance could be improved. One way to improve it might be to remove the Location Filter tag altogether.

Obviously Instagram has the benefit of network effects.

One thing: kerning. The 'A' in the wordmark is in no-man's land! T and G are friendly letters, and I'm sure they'd be more than happy to snuggle up on that A.

One suggestion, enable share via Facebook.

I'd put this closer to the deliberate bucket than not.