Friendly advice for all of the students out there: if you are not sure how to write a title (italics or quotes) or how to cite it, it is always a safe bet to just reproduce whatever your instructor did in the paper prompt. Just...just putting that one out there.
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Tämä twiitti ei ole saatavilla.
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Tämä twiitti ei ole saatavilla.
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Tämä twiitti ei ole saatavilla.
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In any kind of actual writing, you don't get to just pick your register, format and style and go with it: you are expected to conform to the register, format and style of the publication. That skill - understand the demands of the assignment and perform them - is a useful one.
And no editor is going to be the least bit amused if you tell them that their house style is wrong because it deviates from Chicago or MLA or APA or whatever in this or that way. What they will do is consign your submission/pitch to the circular file.