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Um yeah, the moment you type/paste a link in a post, it loads a preview and tries to pick a good representative picture of the page. As far as I can tell the image is even mirrored on Facebook's CDN for faster loading. It's not like they're subtle about it.

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Correct. This is the open graph bot. You can force fb to scrape your site at will and clear the current cached image preview.

https://developers.facebook.com/tools/lint

This is the part that happens before you send the message. The post is talking about the automated browser that visits the link after you post it and waits for 15 seconds with socket.io (thus javascript activated).

Oh. Something to do with trackbacks then, maybe?

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