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That tricky thing about server-side tracking nobody talks about

Original: Agency, Transparency, and Control: Unsolved Problems With Server-Side Tagging

May 25, 2025
14 min read
Opinion
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Agency, Transparency, And Control: Unsolved Problems With Server-side Tagging

Summary

Simo Ahava critiques blind spots in server-side tagging—especially around user rights.

Who This Is For

Analytics Engineers
Technical Marketers
Marketing Ops

Key Takeaways

  • Server-side tagging inadvertently breaks ad blockers, reducing user control over their browsing experience
  • Data stream consolidation creates complex scenarios where user privacy choices aren't properly respected across vendors
  • There's no standardized way for websites to detect which vendors are blocked by user's ad blockers
  • Current server-side implementations lack transparency - users can't see what data flows are happening behind the scenes
  • Technical solutions like mock requests to check blocked domains face CSP policy restrictions

Tools & Technologies

Google Tag Manager Server-Side Google Analytics 4 Facebook Pixel Ad blockers Content Security Policy (CSP) Brave Browser

Topics Covered

privacy governance gtm consent