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Embed code should use embed theme, not default theme!!!
When you embed your forum into Facebook, or wherever else, it should use the EMBED theme. When you are using it on your website, it should use whatever you set to default. This would be amazing. Let's get this out as a feature - I'm sure I'm not the only crazy one who thinks it will be useful!
You aren't crazy. This is actually a non-trivial feature to implement though since the site doesn't know it's embedded on the server on most requests. We have some ideas on how to get around it, but it involves having a separate embed url which could hurt SEO.
Is there any solution for this already? Because, well, it's 2014 now...
FYI I've posted a solution here: