I keep on getting the following error:
duplicate symbol _llvm.embedded.module in: /Users/name/Documents/FacebookSDKs-iOS-20150910/FBSDKCoreKit.framework/FBSD
I faced the same issue of duplicate symbols. I was using Xcode 6.4 but later when I upgraded to Xcode 7.0 It Worked fine for me. I would suggest to Upgrade your Xcode to 7.0 if you are using earlier one.