1. Social Media for Customer Service- Mashable
  2. Reaching Out To a Wide Audience: A Twitter Case Study-IdealWare
  3. 5 Small Business Social Media Success Stories- Mashable
  4. How Social Media Drives New Business: Six Case Studies-Techcrunch
  5. 3 Things We Can Learn From IKEA’s Facebook Campaign-Penn-Olson
  6. Lady Gaga Case Study-Mashable
  7. Case Study: 5 Factors Behind One Startup’s Rapid Growth-Mashable
  8. I now pronounce you monetized: a YouTube video case study-Googleblog
  9. Google Marketing Case Study-Mashable
  10. Case Studies in Freemium: Pandora, Dropbox, Evernote, Automattic and MailChimp-GigaOm
  11. Lessons Learned from 21 Case Studies in Conversion Rate Optimization-Seomoz
  12. Case Study: Mobile Marketing-eMarketer

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Thomas Oppong is the founder @Alltopstartups.