After syncing my iPhone recently I noticed that a lot of my contacts are duplicates, and some contacts were created that I don't even have contact info for (Facebook friends whose emails and phone numbers I don't have). Is there somewhere in the settings that I can go and fix this? Not sure if it's an iPhone issue or a Facebook one so I'm lost as to where to start and I'm trying to avoid having to sit and manually go through deleting the ones that shouldn't be there.