Growth loops vs funnels

A funnel is linear: acquire → activate → retain → expand. A loop is circular: each acquired customer drives more acquisition via referrals, content, or network effects. Loops compound; funnels leak.

Viral loops

One user invites others who become users who invite others. Dropbox referral program was the classic.

Content loops

Users create content, content attracts visitors, visitors convert to users who create more content. Pinterest, Quora, Stack Overflow.

Paid loops

Revenue from acquired customers funds acquisition of more customers. Only works when LTV:CAC is strong.

Sales-led loops

Sales close customers who refer more customers. B2B enterprise.

Why they beat funnels

A funnel's output is a fraction of its input (decay). A loop's output grows its own input (compound).

What to do with this

• Map your current growth as a loop, not a funnel, if no output feeds back into input, you have a funnel pretending to be a loop
• Pick the one loop type that fits your product (viral, content, paid, sales-led), don't try to run all four at once
• Measure the loop's K-factor (customers produced per customer), below 1 means you still need paid acquisition on top
• Shorten the loop cycle time, shaving days off the invite-to-activation cycle compounds faster than raising K
• Instrument the loop end-to-end before claiming it works, most "viral" products have K under 1 on close measurement