1. Yes, myself and another engineer (@schimmy_changa) spent about 4 months getting it ready for public use after releasing the initial version internally. 2. T

1. Yes, myself and another engineer (@schimmy_changa) spent about 4 months getting it ready for public use after releasing the initial version internally. 2. That's unique visitors "currently" on your site, where that's defined as having visited a page in the last five minutes. The question marks provide more detail on the various metrics. 3. Everything is computed in Storm. The reach (unique visitor) calculations are done using some proprietary stuff I don't think I can talk about (although we're working on a more engineering-focused blog post that will have more of these details).