I have nothing to add. It's true, it's so true. 

Huffington Post: Six Reasons Every Brand Should Blog, 2011-Jul-11, by Paula Berg

• Companies that blog have two times the number of inbound links versus companies that don't
• 46% of companies with blogs have acquired customers from a blog-generated lead
• 58% say that they are better-known in their industry because of their blog
• 56% say that their blog has helped their company establish a positioning as a thought leader within the industry 
• [Statistics from Hubspot's The State of Inbound Marketing Survey]

Despite the evidence in favor of blogging, with the rise of Twitter and Facebook, many brands are reluctant to blog. While blogs can be a lot of work, they provide a foundation for information on the web and an owned platform for your social business.