BTW can be used in most informal messages to add additional information or irrelevant statement. For instance:
By the way, I had shared you the photos in the evening.
BTW, did you go to the new town cafe?
“BTW, I might be late tomorrow.”
These illustrations demonstrate that the abbreviation will bring fast, colloquial touches to a message. It maintains interactions as alive and informal, which helps to share spontaneous thoughts as well as be in contact with friends online communities.