n. A photographic self-portrait, particularly one taken with the intent of posting it to a social network.
This is the shot we've all been waiting for: the first time that our robot on Mars would rotate its camera and snap an image of its Short Circuit-like head.

This is, as the kids would say, a "selfie," a photo taken with the intent to post it to social media sites.
—Alexis Madrigal, “Mars Curiosity Rover Takes a Selfie,” The Atlantic, September 10, 2012
Log on to twitter, type in the hashtag #selfies, and watch as a stream of photo links appear. Every minute or two a new one pops up: a teen in a summer dress, a man wearing earrings and a crucifix, a woman in large aviator glasses, a girl with pale blue eyes staring out from the screen.

A selfie is a photo someone takes of themselves, usually on a smartphone.
—Larissa Nicholson, “Look-at-me generation,” Canberra Times, September 09, 2012
2002 (earliest)
Um, drunk at a mates 21st, I tripped ofer and landed lip first (with front teeth coming a very close second) on a set of steps. I had a hole about 1cm long right through my bottom lip. And sorry about the focus, it was a selfie.
—Hopey, “re: Dissolvable stitches,” ABC Online, September 13, 2002
Oxford Dictionaries Onlines announced on November 18, 2013 that selfie was their Word of the Year.