I remember back a few years ago, a neighbor of mine tried to get me to join it. I ended up getting a relentless barrage of “Join Us” spam email from them and decided right there they were trying too hard - and for what? To be ‘neighborly?’
I got those too and finally joined, but I don’t participate. ND is useful to scan for local vendors of everything, good and bad. For example, a bad or unreliable handyman or house painter who touts for business on ND and elsewhere in the area will sometimes get outed by disappointed and irate customers. Good to have such information for future reference.