Facebook have launched their own static type checker for Python, as an alternative to mypy!
https://m.facebook.com/notes/protect-the-graph/pyre-fast-type-checking-for-python/2048520695388071/
It uses the same syntax, but seems more focused on Language Server Protocol integration.
miniblog.
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Facebook's warning against socially-engineered XSS is neat. It's a shame it's necessary though.
"Stories take an average of 8 seconds to load, by far the slowest single content type on Facebook." http://t.co/XdvR87MPo2 (web is bonkers!)
CSS browser prefixes have become a compatibility issue: https://groups.google.com/forum/m/#!topic/mozilla.compatibility/ekZBqfOnzTc/discussion (interesting Facebook sends browser-specific CSS for perf!)