why block these sites?
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Valleywag
“On March 4, 2014, Gawker's tech-focused subsidiary Valleywag published “Startup Flying Dateable Women to San Francisco Like It's Imperial Japan,” stating, “A startup called The Dating Ring has taken its inspiration from an unlikely source: the ‘comfort women’ of World War II.”
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Hacker News
Hacker News is notorious as an echo chamber for ignorant and divisive views. It is your humble maintainer's opinion that there are far better news sources out there.
how to block
This command appends list.txt to your /etc/hosts file. To prevent you from seeing them.
curl -fsSL https://raw.githubusercontent.com/llkats/the-list/master/list.txt >> /etc/hosts
The flags are there to handle error cases more gracefully and safely handle redirects. See man curl for a more comprehensive explanation.