I\'m having trouble getting Facebook Connect working. I (attempt) to follow the instructions located at http://www.mobisoftinfotech.com/blog/iphone/iphone-fbconnect-facebook-con
In addition to copying the headers into your project, you also need to copy the implementation (.m) files. Make sure they're included in your target's Compile Sources build phase after you copy them in.
The Facebook Connect SDK has been deprecated. Pull down the Facebook iOS SDK from Github. It comes with a working example and all you need to do is replace your appId in two places. If you run into issues upgrading it to Xcode 4, see this guide on upgrading.