Online social networks - Economic aspects.

MacroWikinomics : rebooting business and the world by: Williams, Anthony D.; Tapscott, Don (Language materials, printed)

ROI of $ocial media : how to improve the return on your social marketing investment by: Groves, Steven; Powell, Guy R.; Dimos, Jerry (Language materials, printed)

Social media metrics : how to measure and optimize your marketing investment by: Sterne, Jim (Language materials, printed)

Trust agents : using the web to build influence, improve reputation, and earn trust by: Smith, Julien; Brogan, Chris (Language materials, printed)