Glossary
First comment
The first comment is a comment posted by the account itself immediately after publishing, often used to hold hashtags or a link.
What it does not tell you
Putting hashtags there rather than in the caption is a habit inherited from older advice, and the evidence that it changes reach is weak. What it genuinely does is keep the caption clean, which is a reason on its own. It is also a useful place to put the thing people will ask for, since a pinned first comment is visible before anybody scrolls the replies.
Now the harder question. What do yours say?
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