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During the event, Zuckerberg showcased how donning smart glasses allows him to capture video while walking and running at the same time.

He showed how the smart glasses, when paired with a smart wristband, could be used to write and send text by subtly moving one’s fingers.

"Generally, the one who introduces the technology just knows how to do it better."

Even limited access could reveal how the technology drives engagement, moderation and ad targeting - all the things that make the app so profitable, she adds.

For one, it is not clear how US-owned and operated TikTok would interact with TikTok elsewhere, which would be still be owned by ByteDance.