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Roofarena is basically the Million Dollar Homepage concept built as a graphical layer on top of Google Maps. The idea is that any roof in Manhattan is for sale and

The perennial debate surrounding Twitter's revenue model continues to live on. The micro-blogging service has succeeded in building a strong, loyal following, but failed to capitalize on it. Such a

Identified Hits is a new Facebook ad network that is taking a page from the Beacon play book. Beacon, you'll remember, is Facebook's endorsement-based ad service that uses user actions