changed from http://www.gravatar.com to https://secure.gravatar.com. This should have been default so that any friendica site using ssl would not have to edit this to have a completed ssl setup.
$hash = md5(trim(strtolower($b['email'])));
- $url = 'http://www.gravatar.com/avatar/' .$hash .'.jpg';
+ $url = 'https://secure.gravatar.com/avatar/' .$hash .'.jpg';
$url .= '?s=' .$b['size'] .'&r=' .$rating;
if ($default_avatar != "gravatar")
$url .= '&d=' .$default_avatar;