Format opengraph pictures properly with image styles

I know this is stretching a bit, but it is possible to automatically format og:image images in the style required by opengraph - i.e. at least 50x50px and an aspect ratio no greater than 3:1. I have coded auto opengraph to do this. The part of my code that creates the image style and actions is at the very bottom of the module code and I invite you to steal it. I have hacked something together to work around the fact that tokens can't yet distinguish between image formats (see around line 230) but I'm hoping for more token support instead.