[liberationtech] Third-party script inclusions

[Reed Black]

Everybody is asking Facebook, Google et al whether they've been
compelled to share users' personal information, but I've yet to hear
whether they've been asked to selectively alter the scripts they serve
to millions of third-party sites for analytics, fonts, social widgets,
etc.

Has anybody been researching this?

Are there mechanisms for site operators to determine whether all users
get the same result from third-party script inclusions?

By compelling one of the big operators to selectively alter the
javascript they deliver, activity on millions of sites could be
revealed to prying eyes.