Issue 287 · The Referral Loop
A 4-step referral loop that added 612 newsletter subs in 28 days — and the one we killed after it stopped compounding.
The lede. In August we ran a four-step referral loop on the homepage of The TLC Blog. It cost $0 to build (one Notion doc, one Airtable base, two Zapier zaps) and produced 612 net-new newsletter subscribers in 28 days. The open rate on the referral emails was 71%. The unsubscribe rate was 0.3%. Here is exactly what we did, what it cost, what we measured, and the week we turned it off because the marginal reader was no longer worth the friction we were asking existing readers to absorb.
The lesson. A referral loop is not a "feature." It is a small contract you make with your most engaged readers. The contract says: I will spend twenty seconds of my reputation recommending you to a friend; in exchange, you will give me something I actually want. That exchange only works if the reward is calibrated to the effort and if the loop is shut down the moment the marginal reader stops being worth the ask. We let ours run three weeks too long. That is on us. Here is how we will know sooner next time.
The artifact. A Notion template with the four steps, the copy we used, the Airtable schema, and the dashboard we used to decide when to shut it down. Paste it into your own workspace; the only thing you change is the reward.