Mark Zuckerberg

After the January 2018 News Feed changes favoring friends and family, time spent on Facebook and some engagement measures will decline (inferred window: 2018).

Accurate ●●●●●
“By making these changes, I expect the time people spend on Facebook and some measures of engagement will go down.”
Said on
11 January 2018 · Facebook post announcing News Feed changes, as quoted by Reuters
Source
Facebook unveils sweeping changes, says engagement may fall · Gulf News (Reuters)
Should come true
2018
How sure they sounded
I expect
Categories
Technology
Importance
2 of 5 · Concerned engagement on the world's largest social network and the publishers and advertisers who depend on it.

Outcome

Accurate Happened 31 December 2018.

Window inferred as 2018. On the Q4 2017 call Zuckerberg reported daily use down about 50 million hours from the feed changes, and eMarketer later found US adult users' daily Facebook time fell from 41 minutes in 2017 to 38 in 2018, partly from the down-ranking of viral video and clickbait.

Evidence:

History
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