This should be trivial but sometimes things don't work and for me this was one of the days where multiple things go wrong some from me and others from facebook and android to make a solid challenge.
In summary I wanted to implement facebook share in android app, I had the sdk but it wasn't plugged in my app, and to do that you need to follow the facebook get started guide by creating an app and adding the id in the manifest <meta-data android:name="com.facebook.sdk.ApplicationId" android:value="@string/app_id"/> now at one step facebook tells you to generate a Hash key as signature for your app.. they tell you to use openSSL utility, that just didn't work with me and generated wrong hash so after research I was able to fix my issues and integration with facebook worked. That day I wrote the below answer to this stack overflow question on this specific issue : http://stackoverflow.com/questions/20301025/facebook-key-hash-does-not-match-any-stored-ke…
Blog about what I try or want to try.. while kids are sleeping !