Twitter's Evan Williams and Biz Stone Open D7 Conference

Walt Mossberg and Kara Swisher interview Twitter founders to kick-off the All Things Digital Conference. Highlights:
- Twitter is still in its infancy
- 57% of twitter folks don't use it more than 1x per month
- Move from "what is twitter" to "I'm addicted"
- Grew only after 9 months
- Real-time search (lots of hype)
- Different and better ways to discover information
- Scale (but how?)
- Discovery (not analytics)