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Case · M3 × Spread (professional network)

LinkedIn: invitations sent in your name

LinkedIn's Add Connections imported members' contacts and emailed them invitations, followed by two automatic reminders using the member's name. A class action argued members had not agreed to the reminders. LinkedIn settled for $13M in 2015, denying wrongdoing.

M3 ×SpreadContent / community

The outcome · 2015

Perkins v. LinkedIn: a $13M settlement announced in Oct 2015 (final approval in Feb 2016) for Add Connections users from Sept 2011 to Oct 2014. The suit alleged members agreed to the first invitation but not the two reminder emails. LinkedIn denied wrongdoing.

Case grade for the number: A. Evidence grade for the mechanism link: C.
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Stage cell: M3 × Spread (professional network).

What they did. Contact import plus an automatic invitation email and two reminder emails to people who had not accepted, each carrying the member's name and photo.

The mechanism. A message from a friend is a value-carrying relationship trigger HK-TRG08 (Hooked Ch.2) and an endless-chain referral INF-T-LK-02 (Influence Ch.5, p.128); endorsements and invites are one-click social prods GT#62 (Actionable Gamification Ch.9, p.222). Hooked's rule is to earn sharing, never trick it HK-TRG10 (Hooked Ch.2). The reminders crossed from earned to assumed consent.

The outcome. $13M settlement (2015) Case grade A. From a regulator, a public filing or a peer-reviewed study., covering Sept 2011-Oct 2014 users; LinkedIn denied wrongdoing and said it would be clearer about reminder emails.

What it means at your stage. Referral and invite loops (M3+) need per-message consent for anything sent in a user's name, a visible preview, and no silent follow-ups. Track invite acceptance alongside spam complaints and unsubscribes.

Caveats. A settlement, not a liability finding. Mechanism link Evidence grade C. Limited evidence: few or small studies..

Would you have called it?

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The techniques behind it

Each one is a starting point, not a recipe. Gamify It turns a technique into an experiment card for your product: the change, the metric, the guardrail and how long the test needs at your traffic.

  • TechniqueEvidence grade C. Limited evidence: few or small studies.

    Invites that carry value to the person invited

    value-carrying invites

    Design normal use so it sends something useful to people who aren't users yet: a payment, a shared file, a finished result. The recipient gets value on first contact, and the sender's output carries a light, honest attribution.

  • TechniqueEvidence grade D. Practitioner framework or anecdote: plausible, untested.

    Social Prods (GT#62)

    one-tap social gesture

    A minimal-effort social interaction, often a single tap, that notifies the recipient and invites a reply: a like, a kudos, a wave to a new member. It removes the need to be witty, so more people interact; made too plentiful, the signal loses meaning.

  • TechniqueEvidence grade C. Limited evidence: few or small studies.

    Referral page that names the referrer

    invite page from a named friend

    After a positive moment, ask "Who else would benefit?", then send each invitee to a page that names and shows the referrer ("Ana uses this for her client reports and thought you might too") and gives them something useful. A friend's name opens the door; contact harvesting and invites sent without consent close it.

  • TechniqueEvidence grade B. Moderate evidence: solid studies with some limits.

    Keep users in control: free-to-say-no asks and opt-in exposure

    asks that respect choice

    Word requests (upgrade, survey, referral, permission) so users hear they can say no, make any feature that exposes their identity or activity opt-in, and start new users from something they already enjoy rather than a chore.

Limits

What we don’t claim

  • The Hook Model is a practical design tool, not a validated or complete theory of behavior.Hooked, Introduction
  • Octalysis is a practitioner framework built from observing games, not a validated scientific model.Actionable Gamification Ch.15, pp.399-400
  • No success is attributed to a single technique: real outcomes have many causes.
  • Company names are used editorially; no endorsement is implied.

Sources

Source IDs: CASE-M03HK-TRG08HK-TRG10GT#62INF-T-LK-02

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

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