Lol!
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I totally understand what you mean dear geminibella and you're right. I just wanted to say this happens in very very rare posts, just 3%!
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And most of the times its about something that is not useful to other people from other countries. Like if one day I want to ask the people here about my husband's military service in Iran I would definitely use some persian words, because honestly I don't know how to translate something like "nezam vazifeh"!! ... I've seen some Arabic posts here too, but I just guessed the people in that language wanted to say something to each other which makes sense in their own language. But of course you're TOTALLY right and this should not become something very usual and often!
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P.S.: persian words are not as long as the example and they're much nicer with a beautiful combination of vowels and consonants!