Flock — Photos Together (free, iTunes, Bump Technologies, Inc.): If you've ever been at an event and wanted someone to email you the photo they just took, this app, from the creators of the popular phone-to-phone sharing app Bump, might be for you. Take photos using any camera app, and Flock figures out which of your friends were with you at the same event and shares photos with your permission. It works best the more friends you have who are using Flock.
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