When Scott Alexander posted his final blog entry, someone on the HN thread linked to internet archive which I used to read the first 10 or so blog posts since I had never read that blog before.

Now some 6-8 weeks later I go back to continue reading and I found that any posts dealing with social issues from those first 10 was no longer accessible even though I read them on the internet archive on those same links not more than 2 months ago