When someone links to me, I often gets Trackback links in comment under the linked article. Should I keep or erase these trackbacks? I mean, they are links, so they are then reciprocial links...
It is up to you. My blog is dofollow and all trackbacks will give dofollow backlinks to those who link me. There are other method of how to increase search ranking for certain keywords. Of course, getting a backlink from your competitor for targeted keyword is impossible. But, it is easy to get a link from trackback. I prefer not to show the trackbacks.