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Website Visitor Identification

How anonymous visitor identification works: the five methods, person-level vs company-level match rates, what it costs, and whether an IP address is PII.

Third-Party Identity Graphs vs First-Party Customer Data Identification for Ecommerce Stores
Website Visitor Identification·41 min read

Website Visitor Identification for Ecommerce: How Identity Graphs and Server-Side Tracking Actually Work (2026)

97% of your visitors leave without buying — and the industry built to identify them is split into two camps. One buys email addresses from third-party data brokers with spam rates 50–125x the ecommerce average. The other recognizes your own customers when they return, using server-side tracking your ESP can't do alone. This guide breaks down identity graphs, confidence scoring, data decay, and the match-rate math most vendors hope you never run.