How to develop a Facebook Chat app with Facebook Chat API

My requirement is to develop a Facebook chat app which is like FB Messenger.So how can i do that is it possible to do that ?
Dileepa S. Rajapaksa
Trainee Developer
Microsoft, Sri Lanka
Twitter : @dsrajapaksa
Blog : http://www.dileepatech.net

sure you can. You need to use their api:
https://developers.facebook.com/docs/graph-api/reference/v2.2/message
any specific questions? not sure what you looking for
Microsoft Certified Solutions Developer - Windows Store Apps Using C#

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