Dark social

Updated 2026-11-02

Definition

Dark social is sharing that happens in places analytics can't see. Think of Slack threads, WhatsApp groups, text messages, email forwards, and private communities. Someone pastes your link or names your product, and the people who follow it arrive with no referrer.

The term also covers influence with no link at all, such as a mention on a podcast or in a LinkedIn comment. The buyer later types your URL or searches your name.

Example

This example uses made-up numbers. A founder posts your pricing page in a 3,000-person Slack community. Over the week, 400 people click it. Your analytics shows a jump of about 400 direct visits to /pricing and no referrer. Twelve people sign up and pay $99 a month.

Your report says direct traffic earned $1,188 in monthly revenue. The Slack post gets $0 credit. If you ask those twelve how they found you, and eight say "a Slack group," you have evidence for what really happened.

How to spot it

Look for direct traffic landing on deep pages. Few people type a long URL by hand, so a spike of direct visits to a specific blog post or pricing page often means a private share. Mobile app traffic can also strip the referrer. Compare spikes against anything you know happened that week.

The more reliable method is to ask, using self-reported attribution.

How Headstream measures it

Headstream can't see dark social directly, and no tracking tool can. It gives you the means to estimate it. Answers to a heard_about field are grouped and compared with each person's first tracked visit. The "hidden from tracking" stat counts people who named a source that tracking saw as Direct or never saw.

Direct traffic by landing page is available through breakdowns and flows, so you can check where unexplained visits land. See self-reported attribution.