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The three feeds want three different things
A TikTok description is short, conversational and carries three to five specific hashtags — the generic ones do nothing except tell the algorithm you had no idea what your video was about. A Shorts description is closer to search copy: the first line matters because it is indexed, and it should read like something a person would type.
An Instagram Reels caption sits somewhere between the two, and its first two lines are the only ones visible before “more”. Writing one description and pasting it into all three is the most common mistake in this part of the job, and it is why this returns three.