0.2 %is quite significant, isn't it? My small website (www.makonea.com) gets about 90,000 visitors a month on average. (That's about 300 per day?) So that means a post gets shared about once every two days. Maybe I should seriously consider making my posts more shareable. And if I promote it on HN, I'd hope there's a 0.2 %chance that people would check out my site.