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The one rule that has come about in text speak is that writing a word in all caps means you’re either shouting it or are otherwise trying to emphasize it or amplify its effect. If you’re using idk in a more formal context, you should always make sure you capitalize it—or not—...
In online conversations, IDK can be used as a response to a question or as part of a sentence that conveys the lack of information. For example, someone might say “IDK what that means” or “IDK if I can make it tonight.” It saves time and space while keeping the conversation casual...