Try this ....
Add a new plugin ...
Product = vBulletin
Hook Location = postbit_display_complete
Title = choose something you can remember
Execution Order = 5
Plugin PHP Code
Code:
$word = array(
'/news.google.com(?= )/',
'/news.google.com(?= )/',
'/news.google.com(?= )/',
);
$changedword = 'what-ever-you-want-it-changed-to';
$post['message'] = preg_replace($word, $changedword, $post['message']);
This will change news.google.com to what ever you want it changed to instead of deleting thousands of posts and potentially messing something up ...
You can always disable this plugin and everything will go back to it's original state ....