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European police say KidFlix, "one of the largest pedophile platforms in the world," busted in joint operation.
(www.europol.europa.eu)
This is a most excellent place for technology news and articles.
Not just on the dark web (which technically is anything not indexed by search engines) but hidden sites are specifically a TOR thing (though Freenet/Hyphanet has something similar but it's called something else). Usually a TOR hidden site has a URL that ends in .onion and the TOR protocol has a structure for routing .onion addresses.