To me anyway it was an obvious thing to try, though I haven't tried it out to see if they "stole" all of my ideas, or only the basic "connect with your neighbors" part. :)
"Perhaps you did not read the facts, this is no ordinary case. The name 'nextdoor' is in the first Fatdoor patent application, which was private at the time of disclosure! Benchmark agreed in writing to confidentiality, not once, but twice. Clearly, something fishy going on here.
U.S. Patent Application number 2007/0218900 A1 titled “MAP BASED NEIGHBORHOOD SEARCH AND COMMUNITY CONTRIBUTION” (See Exhibit 4) on which the name “Nextdoor.com” is clearly associated as the domain name intended to be used by Fatdoor, Inc. (page 21, col. 1, paragraph [0236])"