According to Instagram, Jennifer Lee, a life and business coach in Oakland, was the first user on the app to tag her photo as a "selfie." (She wasn't, of course, the first user to post a selfie.)
The photo was taken on Jan. 16, 2011, and tagged in the comments on Jan. 27, at 2:18 p.m. ET — the same day Instagram introduced hashtags. The company said more than 57 million Instagrams have been tagged #selfie since.