The metric that outgrew its creator
Domain Authority was designed as a directional signal — a way for Moz's tools to compare sites against each other on link strength. It was never a Google ranking factor and Fishkin said so, repeatedly, in writing and on stage. That did nothing to stop the industry from turning it into a bidding chip.
Two decades on, agencies still put DA scores into proposals. The gap between what the metric was designed to do and what the market decided to do with it is one of the most useful case studies in SEO — and one Fishkin has kept revisiting rather than defending.
Whiteboard Friday, and why it worked
For eleven years he presented Moz's Whiteboard Friday from an actual whiteboard in an actual office. The format has been copied endlessly and rarely well. The reason the original episodes still play is that Fishkin taught the underlying model of how search works, not the tactic of the moment — which is why a 2013 episode on link intent still holds up in the age of AI Overviews.
Lost and Founder
Lost and Founder (Portfolio, 2018) is a memoir about running Moz that documents the argument he had with his own board, the mental-health cost of scaling, and the venture math that pushed the company into products it should not have shipped. It is essentially anti-marketing for the startup path, from a person who took it further than most.
The SparkToro second act
SparkToro answers a different question: not what a market searches for, but where it already spends attention. The tool surfaces the podcasts, publications, YouTube channels and social accounts that a given audience actually engages with — data that sits upstream of keyword strategy.
The company is capitalised through a hybrid of equity and revenue-based financing, structured so Fishkin and his co-founder can operate the business rather than exit it. SparkToro's ongoing zero-click search research is cited well beyond the SEO trade press.