authenticate using facebook connect through multiple domains via cross domain php?

I know that it's basically impossible to assign more than one domain to one facebook app. But... is there a way for me to communicate to the co开发者_运维问答nnect script on a php page that is in another domain specified as the app url?

So like this: [many domains]------>[special domain for facebook app]---->back to one of the many domains

I'd like any ones thoughts on work arounds for this lame facebook limitation

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Facebook added support for multiple domains now according to their latest blog post. This should eliminate your need for the workaround.

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@Brandon You can have 2 domains if you enable mobile web url. Check my answer