One of the neat features of Sharepoint 2010 is the ability to add tags, notes, and likes to a page. The real fail to this is that if any information exists, it isn’t immediately surfaced. You have to mouseover the icons to force a javascript function to fire, lame.
In a masterpage, you can simply add:
$("a[id^='TagsAndNotes_']").mouseover();
to trigger the function and render the magenta background if comments/likes/tags exist.