I really like the idea, but it seems like it would become pretty intrusive injecting text after every large number on the page. It's especially uncool with headings and titles (<a href="http://i.imgur.com/T3yj1ZD.png" rel="nofollow">http://i.imgur.com/T3yj1ZD.png</a>), I think in those instances it should support a hover+click to expand so it doesn't ruin the look and feel.