You don't have permission to access / on this server.

[d1mnewz]

Clicking facebook-csharp-sdk.github.com or facebooksdk.net redirects you to https://hackerapp.com/ and says:
Forbidden
You don't have permission to access / on this server.

[zapper59]

I'm also seeing 404 from all the links on https://github.com/facebook-csharp-sdk/facebook-csharp-sdk.github.com/blob/master/docs/index.md