add_filter(‘the_tags’ … does not work, please help!

I am using WordPress 2.5. I am having difficulty trying to add_filter the_tags. To illustrate, please look at the test code snippet below:

function add_info_the_tags($content)
        {
            echo "It Works!";
        }

    	add_filter('the_content', 'add_info_the_tags', 1);

    	add_filter('the_title', 'add_info_the_tags', 1);

    	add_filter('the_tags', 'add_info_the_tags', 1);

The first two add_filter worked fine (for ‘the_content’ and ‘the_title’) but the last one did not work (‘the_tags’).

Please help, thanks.

Jason