Boosting your site's page rank? Its better to leave it alone. What do you mean by Google come up with any new strategies in Link Building? Its confusing.
The best method for link building is blog posts, social bookmarking, guest article submissions and social media marketing.
I would suggest building quality web 2.0 blog sites. That way you can build quality people and google will like, link to them, then over time the more sites you add, the bigger private link network you own and control - and it's free if you use free web 2.0 builder sites!
i agree social media in 2015 make you posts unique and eye catching with photos post daily be regular over time you will see results
Creative a good link building is very important and this are some best practice to follow to have good link building strategy for your business. Remember content should be informative that helps you to create a great back link.
Submit articles to article directories Write guest posts for blogs - There are many looking for people who can write guest posts Submit your website to all the top Social bookmarking sites. Create link wheel or buy backlinks from SEOclerks.