The ruby gem for LinkedIn that I'm using is here: http://github.com/pengwynn/linkedin
When calling LinkedIn::Client.new with a valid API Key and Secret, I get this:
undefined method `tap' for #
Other people have had the same problem, see http://developer.linkedin.com/message/2363
Don't think anyone has proposed a solution yet.
This was answered over here on the LinkedIn forums: http://developer.linkedin.com/thread/1170
FYI: Seems like the answer is to upgrade Rails to 2.3.x