MessageParty c0-founder Amanda Peyton imagined a web centric New York, in which the personalities of different services are charted to the appropriate neighborhood.
Twitter symbolizes Wall Street: “Frenetic, Jumbled, Terse, but incredibly powerful.”
Tumblr stands in for West Village and Meatpacking: “Coolness to a fault.”
Worth checking out the whole thing here.
In the meantime, feel free to get even more specific in the comments. Betabeat was thinking 4Chan for the surviving smut of West Times Square and maybe Facebook knock-off Renren for Canal Street.