Social media is often about scale, but Nextdoor bet long ago on something different: that it could grow a big business off smaller, local communities. For years, the plan worked. The 15-year-old company has long been a dominant platform for neighborhood-based conversations, connecting users for everything from lost pet alerts to local business recommendations. Then at some point, growth stalled. Users found less reason to engage with the app beyond transactional use cases. What also turned them ...