Talk:List of ponies/Foals/@comment-4529281-20111015222748

At 15:52 UTC, Saethwr posted on Ponychan that “Somepony on Tumblr found this,” that is, Alicorn Pluto. That’s the first mention I could find or came across. (Throwawaytv added her here 9 minutes later. Kudos.) Does anypony know who this mysterious brony on Tumblr was?

It spread quickly once Ask Twilight had posted it, but that was hours later. It has to be a Tumblr post pre–15:52 UTC.