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This is what I KNOW. FB has always used common information like, work place, high school, home town, mutual friend, etc. But recently I have noticed that the suggested list of friends suddenly are people I have replied to through Outlook email. They have no other association with me other that.
Outlook stores information in a file that contains "fields", like "sent", and those "fields" can be extracted. You can easily do it yourself.

So what does that mean? FB is reading any and all information that contains email addresses that it then uses to scan it's members email list and then because YOU replied to an email that appears in their data base it suggests that person as a friend.

I recently hired a painter through his website and only communicated through email. He immediately came up in the suggested list.