in stackoverflow (here) there is a solution for collecting extra information from visitors, and i want to ask that, is it possible to show the collected information to other visitors in his/her comment section? Thanks...
In the link you have provided it shows how to get the value of the "collected" meta using
$twitter = get_comment_meta($comment_ID,'_twitter',true);
so all that is left for you to do is edit your comments loop and add the next few lines in it.
$extra_field = get_comment_meta($comment_ID,'_extra_field',true); echo $extra_field;
Hope this Helps