Circa 1839 -
An amatuer chemist in Philadelphia, Robert Cornelius, loved the fledgling technology (can you call it that in 1839?) of photography. He set the camera up, took off the lens cap to expose the film to light and what was in front of the camera, ran into the picture, waited for about a minute, then ran back and put the lens cap back on. The results? He called it "the first light picture ever taken. 1839." The folks at The Public Domain Review call it the first ever selfie.