Which Pinterest co-founder became executive chairman in 2022?

The Pinterest co-founder who became executive chairman in 2022 was Ben Silbermann.

Silbermann co-founded Pinterest with Paul Sciarra and Evan Sharp. Before Pinterest, he worked at Google, where he developed an interest in products built around visual discovery and collecting. Pinterest began as a relatively small inspiration and bookmarking service before expanding into a major visual-search and shopping platform.

On June 28, 2022, Pinterest announced that Silbermann would leave the chief executive role and become executive chairman, effective June 29. Bill Ready replaced him as CEO. In the new position, Silbermann remained involved with long-term strategy, product development and the Pinterest community rather than leaving the company entirely.

The wording can cause confusion because Bill Ready became CEO, while Evan Sharp and Paul Sciarra were also co-founders. The question asks specifically about the executive-chairman transition, so the answer is Silbermann, not Ready or either of the other founders.