This used to be just annoying in the past (because of the overall low quality of such sources), but now it's gone too far. Twitter won't let you see the content without logging in anymore. At least this is what I see when I open a Twitter link and scroll down: https://i.imgur.com/E0h2CtQ.png

There are many free blog posting platforms out there that don't annoy users like that and — needless to say — are in a much more readable format. All it takes is a couple of minutes to sign up...

I think such a HN rule could help in promoting common decency on the web.

EDIT: A couple of posters made valid points against an outright ban. Someone suggested flagging paywalls/credential-walls. How about lowering the score for Twitter-link submissions (something like: 1 vote counts 0.5 votes)?