If i knew.. You wouldn't need to tell me, do you even know lol I could guess, you don't like the sites anymore and are killing their rank by creating duplicates maybe?
Just a little SEO experiment of mine, i was tired of people saying "Content is king" in fact i have about 7-8 duplicate sites, some exactly the same, some on new domains, some on expired domain, some with the meta content tweaked but i found all sites got good rankings and all had the content indexed by Google even though the articles were all identical, so basically "Content is king" is a load of BS IMO. But if it bothers you i can change my signature links to something else
LOL This is better than a "Christmas Carol" I think the meta tags are used by google for identifying the link context, and may be palying a role here
Still no negative impact to my site, all rankings are the normal +/-2 which is just everyday flux. If anyone else want to kill my site by pointing "poison" links, or large volumes of links in a short period of time at it please do.