Isabel Castillo

This function removes these fields from the Contact Info section of the WordPress user profile admin page:
AIM
Yahoo IM
Jabber/Google Talk

// Remove Silly Contact Methods

function removesilly_contactmethods( $contactmethods ) {
// here you could add other fields
  unset($contactmethods['yim']); // Remove Yahoo IM
  unset($contactmethods['aim']); // Remove AIM
  unset($contactmethods['jabber']); // Remove Jabber

return $contactmethods;
}

add_filter('user_contactmethods','removesilly_contactmethods',10,1);

If you want to add fields for users to enter their Facebook profile URL, and their Twitter, and Google Plus, take the following code, and insert it into line 4 in the code above.

$contactmethods['facebook'] = 'Facebook'; // Add Facebook
$contactmethods['twitter'] = 'Twitter'; // Add Twitter
$contactmethods['gplus'] = 'Google+'; // Add Google Plus