Over the last week, some of you may have been unable to access the website due to a 520 error.
The error was caused by HHVM continually crashing, which is seemingly a common thing for HHVM to do; and not at all a fault with the server or the people that maintain it.
We have a temporary fix in place, until Facebook fix the reliability of HHVM.
If you have any questions or concerns, don't hesitate to let me know.