Growth loop

A growth loop is growth that feeds itself. New users do something that brings more new users, who do the same. The idea was popularized by Reforge, which argued in July 2018 that the fastest-growing products are better represented as a system of loops than a funnel.

How it works

Reforge describes loops as closed systems: inputs go through a process that generates more output, which is reinvested as input. Compare with a marketing funnel, where you pour people in at the top and some fall out at the bottom; each cycle starts from zero.

Reforge's Pinterest example:

1. A user signs up or returns.
2. They are shown relevant content.
3. They save or repin content, which gives Pinterest quality signals.
4. Pinterest distributes that content to search engines.
5. New people find it through search and sign up, back to step 1.

Common loop types:

• Viral: users invite or expose others through use (shared docs, meeting links).
• Content: users or the company create content that gets found and brings new users.
• Paid: revenue from new customers funds more acquisition.
• Sales: customers become referenceable, which helps close the next deals.

Why it matters for marketers

Loops explain why some products grow faster with the same budget. If each cohort of users brings in part of the next cohort, growth compounds. They also show where to work: find the slowest step in the loop and fix that, rather than adding more inputs.

How it plays out on Reddit

Reddit can power a content loop, as long as each step is genuine:

1. Someone posts a question your product solves.
2. You, or a happy user, give a useful answer that names it.
3. The thread ranks on Google and gets cited by AI tools, so new readers keep finding it.
4. Some readers try the product and it works for them.
5. Those users later recommend it when someone else asks a similar question, back to step 1.

Step 5 is the one that turns marketing into a loop, and it cannot be faked. Answers from alt accounts are astroturfing and break Reddit's rules. The real accelerators are a product people like and replies accurate enough that readers who try it are not disappointed. That loop is the core of community-led growth and word of mouth at search scale.

Common mistakes

• Calling a funnel a loop. If nothing from the output feeds the input, it is a funnel.
• Ignoring the slowest step. A loop runs at the speed of its weakest link.
• Forcing virality. Spammy invite prompts or fake referrals damage the trust the loop depends on.

Frequently asked questions

What is the difference between a growth loop and a funnel?

A funnel is linear: people enter at the top and convert or drop out. A loop is circular: the output of one cycle, such as new users or content, feeds the next.

What is an example of a growth loop?

Pinterest's content loop: users save content, Pinterest distributes it to search engines, people find it through search and sign up, and save more content.

Can Reddit be part of a growth loop?

Yes, as a content and word of mouth loop: helpful answers rank and get cited, bring users, and those users recommend you in new threads.

Sources

1. Reforge: Growth loops are the new funnels (July 2018)