While it's not something you could sustain indefinitely, it's doable over shorter time frames. For instance, I've seen a number of companies do it during YC and for some time after that.
Absolutely, Aaron. Didn't mean to challenge the value of your article. And it's certainly possible over short time periods. But I'm a big fan of growing at ~20% per year, if you can demonstrate that this could continue over a very long time period. (I bet Yo grew at 500% a week for a while.)
