Did you used to have a Flickr or Photobucket account?
Way before Instagram, there were these two picture storage websites called Flickr and Photobucket that people used during the Myspace craze. Did you used to have one or both accounts? I have both but I can't remember the last time I logged on them. Probably like late 2009 or early 2010.
I created a flickr account when I was 14, and stated that I was over 21 years of age on my profile, just so I could see shirtless or nude pictures of dudes.