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Remember, this was established over a decade ago with the PS4/Xbone. It was a very different landscape then.
Regardless Twitter or not, the use case for console -> social media seems pretty clear to me
Also Nintendo and Sony are Japanese companies and Twitter is (or was? I stopped using Twitter even before it was sold, so I am not quite up to date) insanely popular in Japan, that’s most likely the reason why it’s Twitter.