There are a couple of alternatives for you to use:
Alternative 1 - Using Facebook MonoDroid-Samples
You can simply follow the steps given by the page that you referenced yourself:
Download the SDK by clicking here
Extract% with%
Go to folder ZIP
Rotate facebook
Rotate android update project -p .
Rotate ant debug
Copy the zip -r facebook-android-sdk.zip bin/classes.jar bin/AndroidManifest.xml res
file to the Jars folder of your project
Alternative 2 - Using the Xamarin Store coponent
There are several components:
Alternative 3 - Using the Facebook SDK for .NET
This project can be found here , has its code open and is recommended for use in Windows 8 and Windows Phone, in addition to running on Mono / Xamarin