Is Corporate Blogging the Hub of Social Media Marketing?

As part of launching the updated Kindle edition of The Corporate Blogging Book I'm putting together a free e-book that answers the question: Is Corporate Blogging the Hub of Social Media Marketing? I'm asking a dozen or so high-profile blogging and social media experts to weigh in but I am eager to hear from anyone who has an answer. You can guess what I'm driving at. I'm asking whether Twitter supplants a corporate blog because it's so much easier and faster. I'm asking whether you need a corporate blog if you have a Facebook fan page. I'm asking whether it's realistic for most organizations to devote the time and resources to maintaining an effective blog. Thoughts? Would love to hear from you.

Of course, you can be as contrarian as you wish in answering the question.

This is cross-posted at my, er, social media hub www.debbieweil.com if you'd prefer to leave an answer there.