Forrester Blogging ROI Model and GM Case Study
Charlene Li of Forrester Research published two reports on blogging today, co-authored by Chloe Stromberg. The ROI of Blogging outlines a model for companies to evaluate the risks and potential returns of launching a corporate blog (or justify/optimize an existing one). The other, Calculating the ROI of Blogging: A Case Study, applies the model to General Motors’ well-known Fastlane blog, authored by vice chairman Bob Lutz.
While the focus of the reports is how to figure out the financial value of blogging, there’s commentary on the intangibles and a warning not to be over-calculating in your evaluation. This can lead to an overly scientific approach to blogging itself, which could hurt its value to your target audience. Some other insightful findings include:
- The largest contributor of ROI to GM’s Fastlane blog in 2005 and 2006 was press mentions
- The total cost of launching a blog with a team of 4-5 people starts at $25k
- Smart blogging includes monitoring brand discussions in the broader Blogosphere
- Tying benefits to known metrics helps translate blogging ROI more easily
NOTE: Forrester calculated the ROI of press mentions by adding up offline stories and multiplying them by their corresponding advertising values. Next, they added up online stories, estimated traffic for each Web site and multiplied those numbers by the appropriate CPM (Biz360 provides this calculation to clients with the click of a mouse… shh, don’t tell Charlene).
The report provides the following chart to help translate blogging benefits into known metrics/value:

This is the first step in a three step methodology - determining the benefits and translating them into a dollar amount. This should be done directly if possible or by correlating the benefits to metrics that have already been correlated to revenue. Forrester provides the example of correlating broader blogger sentiment generated by the corporate blog to a Net Promoter Score (NPS) that may already have revenue tied to its fluctuations. The second step is to calculate the total cost (hard costs and resources). Finally, calculate the risks and translate them to a dollar value by looking at the likelihood that potential scenarios could occur and what the financial impact would be.
The reports provide guidance on how to perform the calculations and include many case study examples. Charlene’s blog post has more information, excerpts and FAQs.



