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Re:LightSpeed: Rewriting Messenger’s codebase for a faster, ... by greenshackle2 on Monday March 02, 2020 @04:55PM (#22469465)
It seems you are correct:

> We also used quite a few of the OS libraries, including the JSON processing library, rather than building and storing our own libraries in the codebase.

Re:LightSpeed: Rewriting Messenger’s codebase for a faster, ... by saagarjha on Monday March 02, 2020 @07:06PM (#22470505)
Doesn't that mean they're not using third-party libraries?
Re:LightSpeed: Rewriting Messenger’s codebase for a faster, ... by jjnoakes on Monday March 02, 2020 @10:27PM (#22471535)
The 1.7m was pre-rewrite and the quote about using os libraries was post-rewrite; it doesn't prove they counted the libraries in the 1.7m metric but it does imply they bundled more before.