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Existence (2013) 2 stars

In a future world dominated by a neural-link web where people can tune into live …

Calling up a smart-mob was tricky. People might already be too scattered and distracted by the rumor storm. The number to respond might not reach critical mass—in which case all you'd get is a smattering of critics, kibitzers, and loudmouths, doing more harm than good. A below-zero-sum rabble—or bloggle—its collective IQ dropping, rather than climbing, with every new volunteer to join.

Existence by  (Page 256)

Brin seems to know a bit about how people behave in numbers online.