You actually can't find what CMO stands for anywhere on this post, diagram or related Adobe site. My best guess is 'Chief Marketing Officer' though it could be 'Chief Media Officer'. Who knows. Anyhow, the purpose of this diagram is to rate different social media services, such as Digg, Twitter and Flickr, as marketing tools. Properties such as 'Brand Awareness', 'Traffic to Your Site' and 'SEO' are all ranked in red (bad), yellow and green (good)(where 'bad' and 'good' refer to marketing objectives, and not (say) the user's desire to avoid annoying marketing spam). The chart is difficult to read and the 'stamp sheet' design contributes nothing to the message. But, it's from Adobe, so I guess that explains everything.