I disagree about managers being your friend.  I am not looking for my manager to be my friend but if we communicate well then there is the potential for a friendship to foster.  Good managers know how to communicate well with their employees.  They let their employees know that they are all in the same boat and the manager is there to help them and remove hurdles.  Honestly, in my experience my good managers were people I would run through walls for because I valued them as a manager, mentor and friend.  Just my take. 

I think the manager is not my friend comment is a co out statement.