Mashable - Helps to stay on top of how social media is impacting how we connect with customers.
McKinsey Quarterly - They have relevant content on challenges facing todays business world. I also enjoy the interactive tools that they use for sharing information, which is a common challenge for the customer strategist.
Walker - Walker is a customer strategy consulting firm. They use Facebook to distribute blogs and videos and is a great way to keep up-to-date on the topic of customer retention programs, customer listening, and customer insight.
Zappos.com - I enjoy watching the company who built a business model around the customer experience interact on social channels.
Are there other must follow fan pages for professionals who are dedicated to the customer experience?