Every story and comment from the Hacker News API, in a layout borrowed from 2001.
A comment on Auto increment is a terrible idea.
E.g.
uuid v4: de7013fb-658e-40a0-9c02-d23080b57fdb base58 : tt7Udwi9Tx9VE1ze7HDBxi
You could also use base64, but it has some non-URL-friendly characters so it would have to be escaped.
E.g.
Here's a lib I wrote in c++ for doing this, with python and erlang bindings, https://github.com/cieplak/uuid