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BTW meaning is by the way, which is a widely used internet abbreviation that is simply inserted to add additional information, a side note, or a non-combatant remark to a discussion. It also serves to move easily between the subjects or raise a topic that is not related to the topic under discussion. BTW is common with texting, social media posts, friend to friend emails, and daily online conversations. It gives a conversational touch and it keeps the message light and communication seems more natural and spontaneous.

Source: Saferloop