do you use simple facebook connect plugin?
If so use:
remove_action('wp_head','sfc_like_meta');
remove_action('wp_head','sfc_meta_head');
to remove these tags from the head.
But be careful, they are necisary if you are using xfbml in your page for like buttons, or any linking into facebook for that matter.
Id advise adding these open graph (og:title) tags to your head with your own function ie.
function my_head_meta(){
meta tags...
}
add_action('wp_head','my_head_meta')
Facebook developers site has extensive documentation on the use of open graph tags for integration.
Facebook docs.
And use this link linter to check if your site is readable by facebook.
