For the short-term, PPC is generally your best bet. The minute your ad runs, it delivers results. But when the budget stops, so do the benefits. Because SEO relies on your website’s content, linking structure, and meta data, developing a thorough strategy that delivers real results takes more time than setting up a PPC campaign. However, SEO’s results may be more valuable to you and your organization in the long run.
Facebook ads are a great way to get highly targeted traffic to your blog (landing page, fan page, what ever). Although not a free traffic source, it is a great one. The price is not very high and I think it is pretty acceptable considering that you can choose demographics of Facebook users that will see your ad. I had great success getting traffic that converts on one of my niche sites.
The term “organic traffic” is used for referring to the visitors that land on your website as a result of unpaid (“organic”) search results. Organic traffic is the opposite of paid traffic, which defines the visits generated by paid ads. Visitors who are considered organic find your website after using a search engine like Google or Bing, so they are not “referred” by any other website.