facebook-csharp-sdk/facebook-csharp-sdk — pull request #308 by sanjeevdwivedi (2014-07-21 23:28:10+00:00)
Title: Adding signing for Universal binaries and prepping for Facebook.Client universal conversion

Facebook.Client on WP8 and Win8 has access to Facebook.dll internals. The Universal Facebook.dll was missing those annotations. Also, it was not signed.