Go online, look for social media debate around Twitter, and you're a click away from two debates.
1. How does anyone make any money from Twitter?
2. How do you measure ROI on social media?
The answer to the first one is simple. Go into the conference production business, or start manufacturing lanyards. The big winners so far are anybody who cashes in on the thousands of bodies in and around the industry short on paid-for client work, and long on love of the sound of their own voice.