Ogilvy PR
If you watch "Mad Men" (and who doesn't?), you might recall that last season Don Draper sneered at an idea of Peggy's because it was more PR than advertising. Well, Don doesn't know about the internet (yet), but these days the line between PR and advertising is awfully blurry, especially online.
Enter Ogilvy PR's 360 Digital Influence blog.

As the name implies, the blog takes a more holistic look at digital messaging. As you'd expect, that means there's lot of emphasis on social media, especially Facebook and Twitter. But the value of the blog is that the posts aren't limited to a specific doctrine. Instead -- and in keeping with the circular reference in the blog's name -- the content is outside the box. It's not simply a case of "flack says" or "marketer thinks." Instead, what you get are posts like this one on ways that people share opinions in real-time on Twitter. What's great about this post -- and much of what you'll find on this blog -- is that it draws insights from a diverse pool. In this case, the examples come from politics, retail, religion, sports, and entertainment. And what's great about posts like this is that they let you break out of a myopia that can plague any industry.