Matt Cutts explica o smecherie despre cum sa descoperim asemenea link-uri.
Here’s what you can put into userContent.css:

Cod:
a[rel~="nofollow"] {
  border: thin dashed firebrick ! important;
  background-color: rgb(255, 200, 200) ! important;
}
(Note: you may need to restart Firefox as well for the changes to take effect.)
Sau:
Bookmark acest link:

Cod:
javascript:(function()%7Bvar%20links=document.getElementsByTagName('a');for(i=0;i%3Clinks.length;i++)%7Bvar%20theLink=links%5Bi%5D;if(theLink.getAttribute('rel')=='nofollow')%7BtheLink.style.backgroundColor='red';theLink.style.color='white';theLink.style.fontWeight='bold';theLink.style.textDecoration='none';%7D%7D%7D)();
Cum sa il folositi:
Vizitati o pagina si alegeti bookmark-ul, astfel veti "vedea" link-urile rel="nofollow" ( background-ul link-ului e <span style="color:#CC0000">rosu</span>).
Sursa in cazul unor neintelegeri.

Info despre Rel="nofollow" : Simon Willison&#39;s Weblog, No NO follow, Google, Yahoo, MSN Unite On Support For Nofollow Attribute For Links.