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Technique · Hooked

Let what users just did schedule the next prompt

Turn each investment into a reason to return: a saved item gets a price-drop alert, a draft gets a reminder, a message invites a reply, a mutual match notifies both people. Let users set some prompts themselves, and shorten the time from the investment to the return.

Evidence grade C. Limited evidence: few or small studies.Return

Plain label: a loaded next triggerAlso known as: loaded trigger, hook cycle time, earned notifications, reply loop, mutual match, follow a thread, ephemerality

How it works

When users act in the product, they implicitly agree to hear about what follows from that act. Prompts grounded in their own investments are relevant by construction, and a shorter delay from investment to return means more cycles in less time.

Evidence warning

Expiring content or timers must be real; artificial urgency erodes trust.

What the research says

  • A dating app reported about 350M swipes and 3.5M matches a day in mid-2013, each match notifying both people (book account).

    Hooked Ch.5 (Tinder), 2013

How to build it

E-commerce
Saved items generate back-in-stock or price-drop alerts that the user can switch off per item.
Web
'You started a draft; remind you tomorrow?' with a time the user sets.
Mobile
One-tap reply from the notification, so each message invites the next.
B2B
Following a ticket or document sends updates only when it changes.

What can go wrong

  • Treating any action as consent to market unrelated things.
  • Batching that delays the prompt past the moment.

Pairs well with

  • Add an investment step to every loop.
  • Prompt at the moment of need.

In practice

Where it shows up

  • Pinterest · 2026

    Round

    Pinterest: Hooked's textbook example, then and now

    640M global monthly active users in Q2 2026, an all-time high, up 11% YoY and the 11th straight quarter of double-digit user growth (Pinterest release, Aug 4, 2026). About 50M in the book era. Many causes; the Hook is not claimed to have caused the growth.

    M3-M4 ×Return
    Case grade for the number: A. Evidence grade for the mechanism link: D.Analyst inferenceCorrelational

  • Snapchat (Snap Inc.) · 2025

    Round

    Snapchat: Snapstreaks and a state lawsuit

    Utah sued Snap on June 30, 2025; the complaint names Snapstreaks among allegedly gambling-like features aimed at minors. These are allegations, not findings, and Snap disputes them. Snap reported 493M DAU in Q2 2026 (SEC filing).

    M4 ×Return
    Case grade for the number: A. Evidence grade for the mechanism link: D.Analyst inference

Limits

What we don’t claim

  • The Hook Model is a practical design tool, not a validated or complete theory of behavior.Hooked, Introduction
  • Left Brain and Right Brain are a metaphor for extrinsic and intrinsic motivation, not a claim about neuroscience.Actionable Gamification Ch.13, pp.342-343
  • Habit metrics need the longer habit horizon (weeks to months) before they can be read.

Sources

  • Hooked · Nir Eyal

    Ch.5

Source IDs: HK-INV25HK-INV24HK-INV26HK-INV21HK-INV22HK-INV23

Book content is paraphrased, never quoted at length. Last verified October 24, 2026.

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