Congrats on a successful launch!
Some initial thoughts (very similar to @SoleneMa
Cover photos should be a part of the "Create New List" flow rather than in the "Edit" menu since the design relies heavily on the cover photo in various feeds. Similarly, adding a profile pic should be a part of the the create account flow. Right now a beautiful design is not living up to its full potential because of default avatars and backgrounds scattered throughout. A little more friction, but worth it IMO. Another idea would be to programmatically pull a photo from the list/venue depending on the input source.
The actions that can be taken on any given list are not totally clear. I was confused at first that the Document Icon and the Subscribe text were the same action. Also its still not clear to me what the pin does. The share and heart icons are pretty standard UI elements but coupled with the uncertainty of the other icons theres a pretty heavy cognitive load trying to figure out what each button does and if they are mutually exclusive.
This is a personal preference, but I think this app lends itself nicely to a tabbed interface rather than a drawer/hamburger. There are only 4 elements behind the drawer. It requires two taps to navigate to any new element and I often forget that they are back there. The explore feature has a lot of potential, and I would visit it more often if it were at the bottom.
Some smaller nitpicks:
-Liking a list with 0 likes is incrementing to 2 then tapping a second time decrements to 1. Force quitting the app and relaunching goes back to 0. (I'm on iOS 8 Beta 4, so forgive me if it has to do with that).
-The "Find and Invite Friends" screen secondary text says "Find you Facebook friends" and "Find you Twitter friends" rather than "Find your Facebook friends" and "Find your Twitter friends"
Overall I was really impressed and personally think it will be a useful app. One of its strengths is that it works just fine in single player mode, but is strengthened by network effects (similar mechanics to Pinterest: everyone creating their own personal boards creates value for the network). Well done and send my congrats to your team!