Tripadvisor dominates Google for hotel searches
travolution.co.uk
travolution.co.uk
Companies like TripAdvisor literally have an army of 30-40 people whose sold job is link building and they measure how many they are able to generate per day. They literally calculate the "cost-per-link".
So, while they are not buying text links (which Google forbids), they ARE hurling manpower at linkbuilding in a systematic way.
So, if a link is a "vote" and Google is democratic, many SEO-centric sites like TripAdvisor are hiring people to drag voters to the ballot box and persuade them to vote for them.
http://www.juiceanalytics.com/writing/search-competition-tra...
Direct link to the chart http://media.juiceanalytics.com/images/pattern_comparison.pn...