There exists a paradox between what consumers want from a brands social media channels and what the business thinks the consumer wants. This detailed but very worth reading report identifies (and quantifies) those differences. Well worth a read:
(Source: www-935.ibm.com)
Social media is changing how search engines rank web pages this article looks at how. One of the most intersting bits of research revealed:
…tweets and Google+ shares dramatically affected the rank of new, previously unindexed content. The results in most cases were nearly instant.
Here’s a bit more about the article:

Shane Snow is co-founder of Contently.com, an “agile publishing” platform for brands-turned-publishers and freelance journalists. Old school SEO pros cover your ears, or be prepared to adapt your craft: Search engines are changing, and social media is a huge part of that change.