http://www.slate.com/articles/technology/future_tense/2015/06/facebook_on_this_day_feature_is_redefining_history.html

I didn’t know it until recently, but apparently I made history in May 2014. (And it turns out it’s already repeating.) Upon opening the Facebook app last month, I was surprised to find the traditional newsfeed replaced by a full-screen notification about a photograph I posted “1 year ago today”—an extreme close-up of my cat staring me down in bed. At the top of the page, the heading, “On This Day,” signaled both the name of Facebook’s recently launched feature and a lofty expression we’ve all heard many times before: On This Day something important happened. On that day, May 12, Napoleon conquered Venice, the Axis forces surrendered in North Africa, the Soviet Union lifted the Berlin blockade, and my cat gave me the stink-eye because she wanted food now.