You MUST set the "PPConsumerKey" value in the info plist to the correct Consumer Key for your application! This value comes from the Remote Access App setup on Salesforce.

There is another sample app at https://github.com/cseymourSF/Chatter-API-iOS-Sample showing how to explore feeds in more depth.

The code in Classes/RestKit is the RestKit submodule: https://github.com/RestKit/RestKit

To learn how to use submodules please refer to: http://chrisjean.com/2009/04/20/git-submodules-adding-using-removing-and-updating/