Actually, Google require us to have a natural backlinks for our blog. Saying "Natural Backlinks", Google means to say that we just blog and blog, until other bloggers or webmasters discover our blog and let them establish a link from their websites or blogs back to ours.
However, that is not easy. To make this happens, you need to make your articles interesting and have higher quality because how can other link back to your blog if they don't admire and appreciate the usefulness of your blog's content.
Other bloggers tend to become a little gray in nature. What I mean is that they tried to gain backlinks from other websites manually by creating another new blog, maintaining it and then establishing a link from that new blog back to the old one.
This technique is a little bit in gray. Not really black hat because you can actually interlink all your blogs. They are all your blogs so you have the right to do what you want. The only thing why I said that it's in gray is because Google consider this an artificial backlink not a natural backlink.
So much for that, I am giving away a link to a website at http://angelswayofmakingmoney.weebly.com/. With this, I am not just passing a single vote that website but I am also letting Google crawl that website. But a single vote is not enough for a website to rank higher on the SERP. A blog or a website needs a huge number of natural and quality backlinks.