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I have installed your plugin, thanks a lot. It works in general, but:
users that have registered via Facebook, have their facebook user thumbnail shown in the forum and your plugin recognizes that these users have a user image.
But: In the side panel only their username is shown instead of the user image (even with the option "show only users with photos" active. I suppose this is due because the thumbnails from Facebook are not on the forum server but get loaded from a Facebook URL.
Would it be possible for your plugin to either load the thumbnails from Facebook as well or put these users in the "no photo" category?
Here an example: