Link Popularity Is when many websites which link to your website. more and many other websites are linking to your website then the better the page rank. Because you will be regarded as a websue important websites by search engines.
Some ways to get Link Popularity:
a. Make an article relevant to the content of the website and then submit the article to services such as "article submiter". It is recommended to enroll in ArticleMarketer.
b. Offer something free. By offering something free really good way to get link popularity, because most people like the free. To be noted is the url address that is used to download separately in sub url website.
Some things that can be offered is like: Free web templates, free screensavers, free e-books etc..