[nikolaplejic]

Last time I checked, you could only see the names of your friends in Facebook's profile export archive -- there were no metadata whatsoever (e.g. IDs or profile links). I don't think names themselves are enough to port your social graph.

[icebraining]

Well, for Gmail users, it shouldn't be hard to match names with specific people, if they have them in their contacts.

I don't know exactly what's the file format from FB backup, but it might be possible to identify linked users based on similar content (as long as both users have already uploaded their profile to Google+).