As you can see the major factors are,
- Social Shares
- No. of backlinks from relavant authority sites and pages
- Keyword in Title – In any order – Reduce important but it still important
So If you are building site and pages You should consider getting as much as Social shares from all 3 major social sites, Facebook Google+ and Twitter and also get as much as links from high authority, related to your site niche and high PR pages. Also make sure your keyword in Title.