Nextdoor is a private message board, which is an ideal environment for people who enjoy message boards and the type of conversations they engender, while the unit of content on Placewire is a photo. I believe this enables a different type of conversation and will engage a different set of users.

I think Facebook groups are typically used at micro-local (eg. a city block) scale and it's perfect for sharing information in that context. I'm not sure how that maps to a neighborhood. Do you have any firsthand experience?

I also plan to circulate content in a less geographically siloed way than these quite private platforms.