Ran a test today, used two different hashes on bitly to track the clicks on a link on G+ vs. Twitter. It was a news article -- nothing to do w/ Tech or G+, I didnt share it publicly, just to friends / people who follow me. Results thus far, G+ drove no clicks, nothing. Twitter did what Twitter does.
I should be hanging out in the Newt chat room, interested to see how that goes for +Danny Sullivan and others
Have been working on what I called "scientific visualization" a long time. Invested a lot of time and energy into various forms of concept mapping a la cMap and Compendium. Pushed hard using VRML. Never realized ROI.