What is Link Popularity ?
Search engines determine the relevancy of your website with regard to the number of websites to which your site is linked. How many pages show the search results? That is the question. More the number of pages, more the visibility and audience.
Search engines are not only interested in knowing the content of your website which determine if you are a match for a search. They also look at the content of your website to see that if you are a match for a search. They also look if other websites that can validate by linking. Not only that, the importance of the website connected to you also gives an edge.
The best way to create link popularity is to provide as much information as possible, related to a specific topic. The more important keywords would show better linkages.