Q: Android & fb connect : how to get the right HashKey? I get the facebook error 
the key myAppKey dons't match any allowed key
It actually matches the only allowed key in the facebook app parameters.
Where does the problem come from ?
(I am using Cordova Facebook plugin)

A: You have to create the hash key and add the key in your facebook app settings. Read this -
Facebook Android SDK Getting Started
If you are using latest cordova plugin and then directly started from Step 4 - Run the Sample, it shows the steps to generate hash key and then the step 5 for configuring your Facebook app.
