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Also some, or even many, people think that intercontintental communications use satellites rather than cables.

Facebook Messenger already works with Starlink - https://one.nz/faq/one-nz-satellite-frequently-asked-questio... so Instagram is probably not far off.

Edit: wow even apple music is included in this.

But this covers only a tiny fraction of people who use those apps. Most people don't send anything via satellite when using messenger.

They also might confuse Starlink with GPS satellites which are completely different things.