1) data-href
needs to be an absolute and unique URL for the particular blog post, like so -
<div class="fb-comments" data-href="<?php the_permalink(); ?>" data-width="910"></div>
See the Wordpress Codex for documentation on the_permalink
.
2) For your comment to display on your Facebook Profile you must tick the 'Post to Facebook' checkbox - see the Facebook Comments Widget documentation.