Tumblr is like a directory of the Internet's inside jokes -- you can almost always count on any major trend to turn into a blog.
But a joke can only be carried so far. Meme-like Tumblrs, such as Texts From Hillary and Chicks With Steve Buscemi Eyes, became widespread in a very short amount of time --- then ended their runs almost as quickly.
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Some sites, like Kim Jong-Il Looking at Things, have managed to carry the joke a little further. But eventually, a meme or site reaches its peak and will start to fade.