New studies dump on Twitter and Foursquare as marketing tools

Not. So. Fast, digital marketers. Just when you thought Twitter and Foursquare were going to run away with the prize, Forrester and digital agency 360i release studies saying, respectively, that  only 4 percent of online adults use location-based services  such as Foursquare, and of the 90 percent of tweets sent by people — not businesses — a mere 12 percent mention brands . Then again, you could take the glass half-full approach to these results. OMG! Four percent of adults us…