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Timehop is a mobile app that connects to your social silos and personal cell phone data and displays a unified on this day of photos & posts you made on the current day in previous years.
The app allows you to connect to your Facebook, Twitter, Foursquare, Instagram, Dropbox, and Google Photos account(s) as well as your phone photo gallery, and/or text messages to present data from these sources.
timehopception is what happens when people post screenshots of their on this day reminder and that screenshot shows up on the subsequent on this day a year later.