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Donald Trump's tweets make headlines around the world.

Technically yes, but what impact do they actually have? It's pretty much irrelevant what he says there. Journalists simply like to use it for clicks.

> what impact do they actually have? It's pretty much irrelevant what he says there

They literally cannot be irrelevant because they're official presidential communications - "The Department of Justice on Monday told a federal district court judge In Washington, D.C. that Donald Trump’s tweets are “official statements of the President of the United States.”"

https://www.abajournal.com/news/article/government_says_trum...

there's an impact on stock market: https://www.athensjournals.gr/business/2018-4-4-2-Colonescu....

see also just a few months ago. https://www.cnbc.com/2020/05/01/tesla-ceo-elon-musk-says-sto...

Musk is indeed a good example: Tesla has officially registered his Twitter account as an official communications channel (probably because otherwise they'd get in trouble for him posting financially relevant information there first), so if your job involves trading Tesla shares you pretty much must pay attention to it.

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