Although most people who post images on the internet are happy enough to explain, there are some who apparently disappear completely as soon as people have questions.
Naturally, those are the times in which the images are at their most mysterious and the context is the most sorely needed. Nothing gets people going like a big mystery so such posts are usually the subject of intense speculation that can go on for years if their uploader never comes back.
And as fun as such mysteries are, they can also inspire some seriously intense obsessions. Fortunately, we should have enough context for most of the otherwise strange pictures we're about to see for things to go quite that far.