Hello,
i'm Milan, software engineer and developer with more than 9 years of experience.
I already made very similar software, it is using facebook graph api and downloading posts and comments to remote database.
It is made to detect an order inside comment, in case comment contains product sku, it is automatically replying.
So basically i have almost ready project, i just need some more details from you.
Let me know if you are interested in my proposal, so we can talk.
Regards,
Milan