I have finally discovered why I'm receiving too many errors from Google Webmaster Tools: this module always display all messages, but the ones that are grouped with other are styled with "display: none". That can't be right:

- anyone that has a little knowledge of HTML/CSS can discover a delete message link, even if it'd not be able to do that because of permissions (even anonymous can find this), and can start playing with the menu call trying to find some exploit, as do the Google crawlers for searching;

- it terribly grows the html code size. If I'm choosing to group activities messages that are alike, it's because I'd like to save user reading AND file size.