Use any framework that you'd like (e.g. Strengths, Weaknesses, Opportunities, Threats), Sure to answer at least the following questions:

• Is there a user need that is not met by existing social networks that Nextdoor can satisfy?
• Does Nextdoor do a good job in addressing that need - why or why not?
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• What do you think of the ways in which Nextdoor acquires and engages users? 
• How defensible is Nextdoor's relationship with users? How does this compare to other social networks?
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• How does Nextdoor make money and how can it make more? What kinds of companies might Nextdoor have to compete with for this? 
• Does Nextdoor enjoy any strategic advantage here?
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