There have been a few networks that have tried to emulate what you're describing with regards to local pseudonymity (NextDoor being the first that comes to mind

There have been a few networks that have tried to emulate what you're describing with regards to local pseudonymity (NextDoor being the first that comes to mind), but most of the audience for it just uses a local subreddit or Facebook group now. WhatsApp can also be an option, depending on the country you are in.