(7/1/07 – 6/30/08) from the FDIC. 2009 data (7/1/08 – 6/30/09) is not available yet, but I will report on this data as soon as it becomes available.
A strong correlation (r squared = .91) correlation exists between % of Deposit Market Share and % of Deposit/Checking buzz currently. Banks with more deposits tend to receive more online buzz. I can't say the finding is completely surprising. More customers making deposits means more interaction with a financial institution. More interaction leads to a higher propensity for customers to go online and discuss experiences.
JP Morgan Chase / WAMU, Bank of America and Wells Fargo/Wachovia receive the highest percentage of deposits within the 50 states and the District of Columbia.
Deposit Market Share vs. Deposit/Checking Online Buzz for 2008 (July 1, 2007 - June 30, 2008)

Let me know what you think about this data. I look forward to updating the results with 2009 information once it becomes available.