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Also, we can писать в стол meaning "to write and not give anyone to read"
https://ru-translate.dreamwidth.org/11676094.html

I bet it was.
Now that I have read my own post, I don't think I even answered the question.
My next effort: when в дневник, в журнал are being used, we want to convey the meaning of putting words...

наверняка -- here: непременно, обязательно

I don't know any rule, but usually we write что-либо (observation) кому-либо (to collegue) где-либо (in a letter), а куда (to Paris) отправляем/посылаем...