Scratch that

Correction: the researchers added code to Facebook’s interface to send back a binary value, “did user self-censor.” If Facebook is tracking the content of self-censored posts, they didn’t admit it in the cited research paper.

My bad.

Here’s what they did:
“To mitigate noise in our data, content was tracked
only if at least five characters were entered into the com-
poser or comment box. Content was then marked as “cen-
sored” if it was not shared within the subsequent ten
minutes; using this threshold allowed us to record only the
presence or absence of text entered, not the keystrokes or
content. If content entered were to go unposted for ten
minutes and then be posted, we argue that it was indeed
censored (albeit temporarily). These analyses were con-
ducted in an anonymous manner, so researchers were not
privy to any specific user’s activity. Furthermore, all in-
strumentation was done on the client side. In other words,
the content of self-censored posts and comments was not
sent back to Facebook’s servers: Only a binary value that
content was entered at all.”

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