Promoting Steem on one of the biggest website about computers:
https://www.dobreprogramy.pl/Steem-czyli-zdecentralizowana-siec-spolecznosciowa,Blog,101170.html

Which was added to "wykop.pl" (something like digg.it) and "digged" on the main site
https://www.wykop.pl/link/4879543/steem-czyli-zdecentralizowana-siec-spolecznosciowa/

And I create about ~25 accounts in 2 days (@diosbot)