Maybe via Digg first? There was an old article from 2005<p>Digg Just Might Bury Slashdot
<a href="https://www.wired.com/2005/11/digg-just-might-bury-slashdot/" rel="nofollow">https://www.wired.com/2005/11/digg-just-might-bury-slashdot/</a><p>"Digg's status as the new Slashdot is further enhanced by digg vs dot, a comparison project that finds diggers are usually first to the punch, though users of each site often submit identical stories."
Not sure about migrate exactly, but this definitely feels like early Slashdot in that it is “for love and celebration of curiosity” as opposed to trying to maximize page views. HN being sort of a side effect of YC helps insure it doesn’t commercialize into Something like Hack-a-day (no disrespect, it’s still a good site). Thanks to Dang and everyone that makes this community what it is.