| Link popularity is important to search engine optimization (SEO) because some aspect of link popularity is being used in all search engine algorithms. If the two sites are similar on topic and swapping link then site with more popularity will rank higher.
To increase link popularity to your website search for related site in search engines and link them and also by submitting to directories with related categories also help in increase link popularity to your website.
To check link popularity of your website in top search engines, as usually type your domain directly in the search engine (yourdomain.com) or (link: www.yourdomain.com) to check link popularity in yahoo.com you need to follow this type link:http://www.yourdomain.com |