The US requires visas for some EU citizens, so now all US citizens visiting the EU will be subjected to border formalities too

Yes. You have to install Greasemonkey or Tampermonkey and edit the script for boingboing, but it works like a charm to hide the users who add no value to the site for you (currently a mere five for me, three of them left-wingers)

You’ll also want to mute notifications about their comments in your account settings.

Apparently the Discourse devs are considering integrating similar functionality as a server-side feature. I hope it has back-end analytics to help the mods.

[apologies for the brief off-topic aside]

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