Link Building is the major process of every website..for this we have to create many backlinks to a website that will be possible to through Off-page techniques:
Yes these are the all off page techniques to make links .
But what about google's strategy to consider these activities, according to google it shouldn't be in huge amount to perform< an all activity should be with unique content on good quality websites.
All the techniques are regular and going old but they are effective and if you want to know about new techniques so I think Social Media also a good option and Content is king,so you have to concentrate on your unique content.
Off page techniques:
Social networking sites
Off page strategies have great contribution in building back-links for a website and quality back-links are first priority of Google while deciding PR.
Link Removed by Site Administrator so it doesn't look like you're spamming the site.
Video sharing and slide sharing is the one of the best off page activity to increase SERP.
But now all techniques are not working. Because google will penalize when you don't unnecessary activity.