this post has some explanation. here are current Nitter instance statuses. about half are now non-functional.
i used Nitter.net (which i now learn was just one instance of the larger project) when i wanted to make a tweet and/or its subsequent replies readable for people without Twitter accounts; over the past six months Twitter has made its site all but impossible to view without a login.
is there any other way to make Twitter threads easily viewable to everyone? i tried putting a tweet in archive.is, but it only captured the limited view a non-logged user would see.
