Meta and Yandex use a covert tracking method on Android: their native apps (Facebook, Instagram, Yandex apps) listen on fixed localhost ports, and scripts on websites forward browser cookies and metadata to these apps, linking every browsing session to the user's real identity and bypassing privacy protections[1].
Background
Meta (formerly Facebook) operates the world’s largest social networks, Facebook and Instagram, plus Messenger and WhatsApp[2]; its Meta Pixel is a snippet webmasters install to log visitor actions for ad targeting and campaign measurement. Yandex, Russia’s dominant search engine, also runs browsers, maps, taxis, and marketplaces; its free Yandex.Metrica analytics suite records every click, scroll, and session, giving site owners heat-maps, replay videos, and conversion funnels[3].
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