code: @Override
  	public synchronized void authenticate(Context context, SocializeAuthListener authListener) {
  		if(assertInitialized(context, authListener)) {
  			userSystem.authenticate(context, authListener, this);
  		}
  	}
docs: /*
  (non-Javadoc)
  @see com.socialize.SocializeService#authenticate(android.content.Context, com.socialize.listener.SocializeAuthListener)