A pretty popular search term!
I think these searches come partly from people who are looking for ‘proof’, but also from people who want to learn from the efforts of other companies.
But good social media case studies are hard to find. And besides that, most case studies talk about big brands such as Pepsi, Dell or Zappos.
Over the last year I have been bookmarking links to high quality social media case studies. Most of them are from smaller companies in B2B, B2C, nonprofit and more.