Imgur is a popular image hosting/sharing service. Many images seen on Reddit are hosted on Imgur.
From the Imgur Blog:
We’re ridiculously excited to announce that Imgur is officially teaming up with the Digital Public Library of America (DPLA) to launch an experiment in our gallery from now until August. We’re calling it the Summer of Archives.
The idea of the Summer of Archives is simple: Historical stuff makes the front page all the time.
As part of the Summer of Archives, DPLA will be digging deep into its archives to post OC gems from its massive collection of content into the gallery. In addition to these posts, there’ll also be chances for the Imgurian community to get involved, and to Q&A with historians and other folks participating with us.
The very first installment — collecting 10 GIFs from historical WW2 footage — is in the gallery right now: http://imgur.com/gallery/rKbep