How to fetch Messenger data to my own database? - facebook

I want to fetch my Messenger data to my own database. I want to use that data for my own application. Is it possible? What is the appropriate procedure?

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Can anyone help me for it? Any lead would be very helpful.
I have implemented this functionality in my app recently.
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Using Twitter OAuth, I'm saving the user's data as JSON in a "twitter" field in my database. Likewise, I'm saving the user's Facebook Connect info (including persistent session_key) as JSON in a "facebook" field.
For most operations, this is great. However, I'd like to add a "Find Friends" function that will grab the user's friends from either service, compare against users on my service, and show the resulting list to suggest friends.
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Thanks in advance.
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Joe