This is a basic tutorial on how to link a Facebook account to an Alexa skill using Amazon Account linking.
Make sure you have Node.js installed
git clone https://github.com/matchboxmobile/AlexaFacebook.git
cd AlexaFacebook
npm install alexa-sdk
npm install facebook-node
You now need to zip the index.js and the node_modules file. This is what is needed to upload to Amazon when asked to upload code when setting up a Lamba function.
Full tutorial for this code can be found here (need link)