A Facebook application, "Where I've Been," reportedly sells to TripAdvisor, a division of online travel agency Expedia, for $3 million. This proves the strength of Facebook's so-called "platform" as a vehicle for flipping cheap, trivial ideas to gullible big companies, something everyone in the Valley has been longing for. Update: TripAdvisor is denying some or all of the report, dashing everyone's dreams of Facebook-app millions. [Inside Facebook]