My site gets a lot of splog trackbacks (or the BS term "autoblog" which is what seems to the popular terminology here), all of which i delete since I include a link back to my original post in my RSS feed they're swiping- this way Google is set straight since they link to me but I don't link to them and their duplicate content that I wrote. HOWEVER, when a post I write is linked to by a popular site like Gizmodo, I get a trackback trail of all the splogs that are stealing THEIR content. Should I delete those too or leave them- since they simply link back to me without duplicating MY content.