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Expedia sold trip advisor few years back, now they own another Meta Trivago.

It was never sold. They are both part of the Expedia brands.

In December 2011, TripAdvisor was spun off from Expedia in a public offering. [https://en.wikipedia.org/wiki/TripAdvisor#cite_note-16]

The spun off is a financial maneuver, it doesn't mean the company is not under Expedia.