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Omegle shuts down for good
(www.omegle.com)
This is a most excellent place for technology news and articles.
Probably UUIDs based on fingerprinting the browser/machine. With enough js there's usually enough to qualify a person's activity as unique even with minor changes regarding updates or whatever. You can mitigate it by changing user agent strings or disabling some/all js or site permissions, but they can also block you from using the service for doing so, so ¯\_(ツ)_/¯.