Just poking at the two home pages (tor and not) twitterhbmit57bzbcjnujedrn7uk73geo4ackio4lxdj6t7w6f4zsid.onion is the equivalent of the abs.twimg.com CDN, so assets, javascript files, fonts, etc

I don't immediately see what twitterhpgjerufcvrmzerg2novpipy42rk3anvb5b7np4zggm4rwaqd.onion is being use for though.