Dark Social: What It Is, How to Measure It, and Why Agencies Should Care
Key Takeaways
- Dark social refers to sharing and conversations that happen in private channels - DMs, Slack groups, email forwards, and messaging apps - where traditional analytics cannot track attribution
- A growing number of purchasing decisions are discussed and influenced through dark social channels, making it a critical blind spot for agencies relying solely on trackable attribution
- Focus on the meaningful over the merely measurable - modern buyers do not follow linear, trackable journeys
- Invest in creating content worth sharing in private channels rather than only optimizing for publicly visible engagement metrics
- Attribution models need to account for the reality that the first touchpoint you can measure is rarely the actual first touchpoint in the buyer's journey
- Ask new leads 'how did you hear about us?' in free-text fields to capture dark social signals that analytics tools miss entirely
Gray MacKenzie interviews Shama Hyder, CEO of Zen Media, about dark social - the invisible layer of sharing and conversation that influences buying decisions but lives entirely outside traditional analytics. Shama is a best-selling author, international keynote speaker, and leader of an award-winning PR and marketing firm specializing in B2B companies. The conversation starts with a fun shared-name origin story (Zen Media and ZenPilot) before diving into one of the most misunderstood dynamics in modern marketing.
What Dark Social Actually Means
Dark social is the term for all the sharing and conversation that happens in channels where companies cannot track attribution. When someone shares your blog post in a Slack channel, forwards your email to a colleague, mentions your brand in a WhatsApp group, or recommends your service in a private LinkedIn message - that is dark social. None of those interactions show up in Google Analytics or your CRM’s attribution reporting.
The term was coined by Alexis Madrigal at The Atlantic back in 2012, but the phenomenon has only grown as communication shifts increasingly to private channels. Shama points out that the majority of online sharing now happens through dark social rather than public social feeds. People are more likely to send an article to a specific friend via DM than to share it publicly on their LinkedIn feed.
For agencies, this creates a fundamental measurement challenge. The leads that appear to come from “direct traffic” or “organic search” may have actually been influenced by a recommendation in a private Slack community weeks earlier. The first touchpoint you can measure is almost never the actual first touchpoint in the buyer’s journey.
Why Traditional Attribution Falls Short
Shama describes the dark social model as a necessary shift in how marketers think about measurement. Modern buyers do not follow linear, trackable journeys. They consume content across dozens of channels, discuss options in private groups, ask trusted peers for recommendations, and then show up on your website ready to buy - with your analytics showing nothing but a direct visit.
This reality does not mean attribution is useless. It means attribution needs to be understood as incomplete by design. The data you can track tells part of the story, but agencies that make decisions based solely on trackable metrics will consistently underinvest in the channels that actually drive awareness and consideration.
Shama advocates for focusing on what she calls “the meaningful over the merely measurable.” Vanity metrics like impressions, likes, and shares are easy to track but often correlate poorly with actual business outcomes. Meanwhile, the conversations happening in dark social - where someone tells a peer “you should check out this agency” - are the highest-quality lead source you cannot see in a dashboard.
Practical Approaches to Measuring the Unmeasurable
While you cannot fully track dark social, you can build systems to capture its signals. Shama recommends several practical approaches. First, add a free-text “how did you hear about us?” field to your intake forms and lead capture. This simple question surfaces referrals and recommendations that no analytics tool can detect. When someone writes “my friend mentioned you in our agency owner Slack group,” that is dark social data you would never have captured otherwise.
Second, invest in content designed to be share-worthy in private channels. Long-form research, original data, contrarian takes, and genuinely useful frameworks are the types of content people forward to colleagues. Quick-hit social posts may generate public engagement, but substantive content drives the private sharing that influences buying decisions.
Third, build a presence in the private communities where your buyers spend time. This does not mean pitching your services in every Slack group. It means contributing genuine value - answering questions, sharing insights, being helpful - so that when members of those communities need what you offer, your name surfaces naturally.
Implications for Agency Positioning
For agencies, dark social has direct implications for how you position your services to clients. If a client demands that every dollar of marketing spend be tied to a trackable conversion, they will inevitably cut the brand-building and awareness activities that feed dark social. The result is a short-term focus that undermines long-term pipeline development.
Shama encourages agencies to educate clients about the limitations of attribution and the reality of how buyers actually make decisions. The agency that can explain dark social clearly and build it into their strategy has a significant competitive advantage over agencies that only optimize for measurable last-click conversions.
Resources Mentioned
- Shama Hyder on LinkedIn - CEO of Zen Media
- Shama Hyder - Personal site and speaking
- Zen Media - B2B PR and marketing firm
- The Zen of Social Media Marketing - Shama’s book