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we actually coded this up before Caterina Fake's Pinwheel launched, but the idea is similar. see https://pinwheel.com/

Nice. It's a cool idea, I built one too at one point: thebamapp.com. Built my own backend for it though ;)

Or you could use Stashpix, and post pictures too:

also cool, but anywall is open-source and we built it for the sake of making a fun iOS tutorial

Kudos for open sourcing it!

Parse is open-source?