LMK, is it a formal or informal language?

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LMK is typically regarded as an informal language and is mostly employed in informal communication, text messages or social media chat. It is not a common practice in professional emails or official letter writing or professional communication. Under such circumstances, it would be a good idea to write the entire sentence: Please let me know. Nonetheless, in the context of daily digital communication between friends, classmates, or colleagues, LMK is not offensive and is also accepted and understood quite well without appearing arrogant or disorienting. Know more about what does lmk mean