Facebook experimented with this more than ten years ago. Results were conclusive:

https://www.theatlantic.com/technology/archive/2014/06/everything-we-know-about-facebooks-secret-mood-manipulation-experiment/373648/

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Oh that’s interesting, thx for the link

There's no doubt posts we read influence our mood, even plain text.

But at least here we're not manipulated by some corporation's shadowy algo.