I made the mistake of setting up a Nextdoor account once. It was a cesspit of conspiracy theories and blatant racism with little or nothing of real value to be found, so I deleted my account within a week.
I find local recommendations often look similar to the recommender. Sometimes it's hard to break out of that bubble.
Edit: I ask because that is the mechanic of systemic racism: You're not doing anything, you're probably not racist and likely not even aware of the 'system'. Yet the system still churns out racist outcomes: You know (e.g.) white people, they know white people, and that's who they recommend to you, and who you then end up recommending to others.