Marketing Return on Investment is defined as the incremental profit generated on making that investment usually in advertising products and services, brand building and increasingly brand recall.
The beautiful thing about the Web 2.0 is the opportunities it offers in zero cost marketing.
WordPress Blogs, Ning.com web portals, Facebook fan pages, Linkedin Service provider recommendations and groups, Feedburner newsletters are all zero cost and infinite marketing ROI tools.
However zero cost does not mean free. There is a cost of your time. However if you can spend 8-10 hours at work, sleeping 1 hour less and building your own personal brand through your blog can give you lots of rewards. It’s a tough economy and this social networking phenomenon is now almost a necessity.