A caption is truncated after roughly a line and a half, and expanding it takes a deliberate tap. So the real caption is that first line, and the rest is a reward for the people who already decided.
What wastes it
Almost always the same four things, and all of them are habits rather than mistakes.
- A greeting — “Hey everyone!” spends the line saying nothing
- Throat-clearing — “So I’ve been thinking about…”
- A label — “New blog post” tells them the format, not the reason
- A rhetorical question they have heard before — “Ever struggle with consistency?”
What earns the tap
A specific, slightly incomplete fact. Specific because a detail can only come from you; incomplete because a finished sentence has nowhere to go.
- “We recorded this take at two in the morning and kept the mistake.”
- “Sixteen attempts for one second of footage.”
- “The venue sold out before the poster was finished.”
Write the first line last. It is easier to find the interesting sentence in a caption you have already written than to invent one from an empty field.
One habit worth keeping
Read the first line on its own, with the rest hidden. If it still makes someone want the rest, it works. If it only makes sense as an introduction to what follows, it is not a first line — it is a warm-up, and it can be deleted.