Putting content first is something you hear from the get go when finding out how to be a successful blogger and I'm finally starting to understand that fact, great content does the work for you.
My most successful posts have always been of my own creation, that and breaking news stories in my niches first, these are the types of posts that get me the most natural kind of backlinks. If your not creating it or breaking it then what are you doing? your recycling it and what's the point in making a post that ten thousand other people have already posted? unless you can add to it nicely, not much (something I'm guilty of).
What you could be doing is setting up something where you can quickly browse for breaking news and spend the majority of your time creating content. Which if good enough will spread like wild fire.
So my advice is this, concentrate on creating great content in what ever medium your most comfortable in, set something up to check for breaking news and do your research about anything you think you may be recycling, if you can't add to it, maybe think twice about making a post. Great and unique content will get you the best kind of backlink, natural.