Why haven’t you heard of these link sources before? You have. But you’ve probably been told they are a waste of time by your Web developer, who
claims these big, popular sites aren’t useful for Google optimization.
The reason is that most powerhouse social media sites like Facebook and YouTube put a small piece of code called ‘the no follow’ tag into most areas of their site.

As the name implies, the ‘no follow’ tells search engines: if someone tries to build backlinks to their site from here, don’t follow it. Instead, ignore it.
This was and is done to prevent spammers. If you didn’t have the

‘no-follow’ tag, spammers would create thousands of Facebook profiles,
LinkedIn profiles, and YouTube accounts just to link those sites back to
their website. The ‘no-follow’ breaks the connection you are
trying to make between one website and the next, defeating the purpose
of a link from the perspective of Google optimization (people can of course still click the link and visit your site directly).
But it’ s a fallacy that all social media sites have no-follows. In fact, many sites provide juicy link opportunities. You just need to find them. And we did.
These are all real links, and are entirely legitimate and approved for optimization by Google.
When You Build Backlinks Be Complete!

When it comes to Google Places, Local Listings, LinkedIn and basically
all your social pages and profiles, a complete profile is much more
powerful than an incomplete one. It’s just more information that search
engines can use to figure out what you and your website are about. So
fill out all the details and include your main keywords in those
profiles (for example, ‘we are a landscape company from Dallas
specializing in large commercial and educational institution projects’).
All of this takes a bit of time and grunt work, but if you do it Google
will have a richer collection of sites pointing back to yours in a
consistent, powerful way.
SOURCE:http://www.accraxclusive.com/14-easy-places-to-build-backlinks/