First learn how to turn a profit, then give out advice about how to build a startup... The other way around makes you look a bit silly.
- On Twitter's profitability (this is before Sponsored Tweets launched): http://www.businessweek.com/technology/content/dec2009/tc200...
- Ev's other startup, Pyra Labs (Blogger), had a successful exit in 2003. There are some better details in "Founders at Work".