[lapcat]

> I'm genuinely curious if you've measured this, and how you determined the impact of twitter on your business.

Well, Twitter is basically my only form of promotion. :-)

I've tried a number of forms of advertising, the results of which I can measure directly, but I've lost money every time, so I usually don't bother with that.

There are times when I can measure Twitter's impact directly. For example, I once had a very viral tweet that immediately resulted in a massive sales week. Admittedly, that's pretty rare though.