Referral backlinks serve as a type of “voting system” for search engine rankings. SEMRush suggests building large amounts of links from referring domains, particularly for more difficult keywords. If you have a large number of referral backlinks, you’re pretty much on the fast track to Google’s top rankings. This service gives you the chance to attain 50K backlinks from 5000 referral domains. Top service Features: 50K Backlinks5K Unique Referring domainsMix of dofollow and nofollow links (90% nofollow) Detailed Excel report upon task completionSupports up to 50 URLs/domains and 50 keywords Referral backlinks are known for their ability to blast away the competition, whilst passing on large amounts of link juice to your site.