If you have WordPress blog you will receive a Trackback whenever someone links to your blog post . Trackbacks is one of the link building technique which helps to boost SEO. If you are using Dofollow comment system like Geekyard you should be prepared to fight against spam comments. If you are not aware of Dofollow and nofollow read this article,
Usually enabling Trackbacks leads to spam comments. By default comments and trackbacks are mixed up which makes some confusion in comment discussion area. Its better to separate trackbacks and comments so your blog looks clean and stylish.