The tendency is to give more positive recognition to the people who remind us of ourselves somehow and who actually like us, rather than to the people who make the biggest contributions to the organization. In the long run, it's people in the latter group who will make the most progress in achieving the organization's goals, so monitor your own behavior carefully and make sure you're not accidentally short-changing them, even if they give you the impression that your positive regard doesn't affect them. Some people shy away from positive feedback but appreciate it nonetheless.