I had the same blog post get on HN and on Slashdot. HN link didn't get to the front page, got about 25 human visits. The link on Slashdot got the blog post 2500 visits, plus the Slashdot IP addresses visited tons of other posts and content on my web site. Maybe places don't get "slashdotted" any more, but a link on Slashdot seemingly gets you a ton more visits than a link on HN.

Also, Slashdot visitors use more MacOS and Linux than Windows. The reverse is true of the small number of HN visitors.