I live in Seattle's Capitol Hill neighborhood, which has about 50,000 people in 3-4 square miles, depending on how you count it. I just signed up for NextDoor (

I live in Seattle's Capitol Hill neighborhood, which has about 50,000 people in 3-4 square miles, depending on how you count it. I just signed up for NextDoor (and I find it incredibly creepy that they publicly display my address by default), and found that there are 1200 people who have signed up out of 50,000 possible users. 2.4% is probably a high water mark for signups, and it looks like only a couple hundred people participate on here regularly.