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Not booking.com, but travel sites definitely have gotten caught using Math.random() to generate the "x people are looking!" alerts.

https://twitter.com/OphirHarpaz/status/1184486445039411201

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Oh yeah. Booking doesn't do it because it's big enough that it would get called out - externally and internally. Also, is actually much less snake oily a company than its reputation here or else I wouldn't have worked there for as many years.

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