You might recall 4square & 7 years ago from Foursquare hack day 2011. Essentially it reminds you what you were doing a year ago today via email each morning.
Well, the same folks are responsible for Past Posts, a similar application that shows your Facebook activity from a year ago.
Both are super simple and present your peronal data back to you in a fun way. I suspect we'll start to see more sites and services like this which showcase your social data exhaust.
