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I use ND first, then CL. I've used FB a few times, but mostly it's been scammers (though I have friends who swear by it).

CL is a killer app!

ND?

NextDoor

That was not apparent.

Nor was your pun, at first!

But it's more likely to be apparent to someone who is a parent (the alternate meaning of my handle).

Nextdoor