Presumably the free version of the plugin is not automatic so I’ve tried to find instructions for getting it to add a like button to the comments. I followed your instructions in the thread ‘what do you mean.’
Each comment is now replaced with the following error message:
Warning: call_user_func(my_custom_comments) [function.call-user-func]: First argument is expected to be a valid callback in /home/mashable/public_html/testing/wp-includes/comment-template.php on line 1334
Please provide precise instructions on the correct code and locations.