So-called "celeb bait" ads have been a long-running issue for the company. Engadget has previously documented celeb bait scams on Facebook, including ones that frequently use Elon Musk and Fox News personalities to hawk fake cures for diabetes. The Oversight Board has also criticized the company for not doing enough to combat such scams. In its update, Meta says that "because scam ads are designed to look real, they’re not always easy to detect." The company also noted that it has now enrolled "more than 500,000" celebrities and public figures into its facial recognition system that's meant to automatically detect scam ads using the faces of famous people.
Notice how the highlighted region shrinks at each step. The algorithm never examines points outside the narrowing window. In a balanced tree with nnn points, this takes about log4(n)\log_4(n)log4(n) steps. For a million points, that's roughly 10 steps instead of a million comparisons.
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Credit: Apple TV / Peacock / Netflix
The V3 approach obliterates this race condition by hooking addSourceBuffer at the MediaSource.prototype level, I intercept the creation of every SourceBuffer. The moment a buffer is created and returned, I immediately install a hooked appendBuffer directly on that specific instance; before any page code can even see the instance, let alone cache a reference to its methods. The hooked appendBuffer is installed as an own property of the instance, which takes precedence over the prototype chain. There is no window for fermaw to cache the original. The hook is always first.