Things I have learned, written down.
7 articles
ChatGPT, Gemini and Copilot recommend products now, and the sale happens on your store. This is what they read in a feed, which of the new programs reach a Nordic store yet, and how to see their visits in GA4 without fooling yourself.
Both tools lose data when a visitor declines cookies, and they lose different things. This is what GA4's consent mode and Piwik PRO's anonymous mode each record, what is observed and what is estimated, where the EU's cookie reform stands, and a test to run on one site.
Google now ships official MCP servers for Analytics, Ads and BigQuery, so an agent can answer questions about your numbers. This is how I would give it a seat instead of the keys: read-only identities, ten questions with known answers, and the ways it still goes wrong.
Meta, GA4 and a store can all be right and still disagree. This is what each one counts after Meta's March 2026 attribution change, how to split the gap into named causes, and which number to trust for which decision.
Text in the HTML instead of in scripts, layout shift from 0.28 to 0, no requests to Google's font servers, and tests that keep the structured data true. These are the changes, the numbers before and after, and what Google's own guide says you can ignore.
Jon Loomer's Master Brief says to give Meta a true conversion signal, keep the structure simple and put the effort into creative. I agree, and this is what each point means for a store with a catalog, margins, returns and a checkout.
TypeSafe's Jev answers typed questions about your data in under a second, by its maker's account, and never writes a word. Here is where that fits in a marketing stack, and what to check before trusting it.