DotNetOpenAuth CTP - Facebook bad request

Question

I am trying to use the CTP to connect with Facebook over OAuth 2.0.

I can get the initial request to Facebook working OK, but when it comes back and we call:

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Answer 1

Iain's solution is finally something I made this thing work with.

There is one note for future implementers - seems like Facebook ID property is now exceeding capacity of Int32 type. You might need to change this in FacebookGraph class, I used plain string.

Thanks Iain, your code really helped me!