threadspic.twitter.com/jwAmHKFW9Y
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
So the idea is that you have one syscall that creates a new task, and that task can choose whether to share an read-write address space or have private semantics with copy-on-write.
It’s elegant, but the issue is that POSIX wasn’t designed with that implementation in mind, so you have to jump through hoops to implement POSIX. e.g. “current user” is per-*task* in Linux but per-*process* in POSIX, so glibc has to do horrible things to make it work.
(Those horrible things, BTW, involve sending signals to all threads and making them all call setuid() at the same time in the signal handler. And it’s racy if you do it while threads are exiting IIRC.)
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.