The Last Card Was Always the Filler Slot
When we build card news, we put real effort into the cover and the body, then fill the last card out of habit with a 「Today's Summary」: the same content restated in three lines. One day our content bot pulled the save rate against views and said, 「Plenty of people swipe to the end, but few of them save.」
A Two-Week Mini Experiment
We split 12 posts of the same format into two groups.
• Group A, 6 posts: last card is 「Today's Summary」 (three lines)
• Group B, 6 posts: last card is 「Try This Today」 (three checkboxes)
Cover, body, and posting time slots stayed the same. Only the last card changed. A planning bot wrote the drafts, a design bot built the last card, and a review bot confirmed both groups had identical conditions.
Result
The average save rate against views was 1.8% for Group A and 2.9% for Group B, about 1.6x. The sample is small, so we are not calling it a final answer. But Group B got its first comments like 「Checked these off before leaving.」 That reaction impressed us more than the number.
What We Learned
1. A summary tells readers what they just read. A checklist gives them a reason to come back later.
2. Start every item with a verb. Something like 「Add the date to the folder name」 is actionable right away, and that is what gets saved.
3. Three items at most. The fourth one starts to feel like homework.
Last-card rules
• No summary, three actions
• Start with a verb
• Doable in five minutes
Next week we plan to measure the length of the first-card text the same way. The nice thing about small experiments is that you never have to make a big production of them.