As example, if you put up on a keyword, your website will arise high in the search results for that keyword. You just pay for successful searches where you get visitors to your site so using a PPC engine can very cost-effective.
65 Terrific Social Media Infographics
The Social Landscape...from 2010, but still great info about which channel (excludes Pinterest, of course) does what for your brand.
How to Authentically Grow Your Facebook Group @bestfriendsforfrosting http://bestfriendsforfrosting.com