And everyone in government will quickly conclude that they can't allow this to happen.

This could be the beginning of the end of social media.

If Trump would tweet what the fringe communities want to hear (example: Trump tweets that state law enforcement have started rounding up people with Hawaii shirts and confiscating their weapons and should be seen as enemy combatants and engaged on sight. That would turn ugly very quickly).

A well crafted tweet about e.g the Taliban could easily put US soldiers abroad in harms way immediately too.

Well armed militia who don’t offer diplomatic representation — they are the ones to worry about.

While true, this effectively doesn't matter given the number of people we've bombed since our last declaration of war in 1942 [0].

[0] https://www.senate.gov/pagelayout/history/h_multi_sections_a...

He has fired people over twitter [0] so I'm not sure the scope of one can do there is limited to "marketing/propaganda"

> (Also POTUS is not authorized to declare any wars btw.)

Other nations are not going to read the US law first before deciding if the declaration was or not real.

[0] https://www.theverge.com/2018/3/13/17113950/trump-state-depa...

I mean, when is the last time we officially declared war? It has to have been decades ago.

> Iran has gone TOO FAR! As President I have ordered the use of nuclear weapons against key military targets. We begin bombing in five minutes.

Regardless of the plausibility of the message, it would be likely to trigger a panicked response from foreign militaries. It's not at all implausible that it'd start a war.

[1]: https://en.wikipedia.org/wiki/We_begin_bombing_in_five_minut...

Hell, even just hacking Trump to do it would probably trigger a federal investigation. I doubt this current situation will.