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Nextdoor is an online communities platform that essentially combines classic message boards with Craigslist. The startup spent its first five-and-a-half years building a sizable audience of social-media patrons who are more interested in what’s going on down the street than what friends are up to in other time zones. With the possibility of getting to 100 million users by the end of the decade, it’s now rolling out advertising for the first time, and its own revenue forecast is eye-opening.