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I just released my first (finished) app on the Google Play Store a couple of days ago, Social Motion. It was actually my final year university project and I just decided to release it for the sake of it. The idea was to create an app using the Facebook SDK that could be used easier by the elderly and/or visually impaired, so I went with allowing users to control the app using voice control and touch screen gestures.
I really enjoyed making it, I think using a good public API like Facebooks makes it much more fun to create.