It looks to me like the (alleged) TripAdvisor purchase was first discussed at AppDevCon (a gathering of Facebook developers, entrepreneurs, and investors hosted by SocialMedia) on 8/15. This discussion took place before Inside Facebook wrote up the "Biggest Facebook App Acquisition Yet" post.
Inside Facebook live-blogged the AppDevCon (http://www.insidefacebook.com/2007/08/15/live-from-appdevcon...) and @ 3:23 PM, they quote Naval Ravikant from Hitforge as saying "The value of a Facebook user is going up - at first users were being sold for $0.10, now it's $0.60-$0.70. TripAdvisor just bought Where I've Been for $1.50/user."
There's no indication that anyone who was there was shocked or surprised at this statement. Instead, it seemed like it was presented rather matter-of-factly, like it was common knowledge.
Inside Facebook live-blogged the AppDevCon (http://www.insidefacebook.com/2007/08/15/live-from-appdevcon...) and @ 3:23 PM, they quote Naval Ravikant from Hitforge as saying "The value of a Facebook user is going up - at first users were being sold for $0.10, now it's $0.60-$0.70. TripAdvisor just bought Where I've Been for $1.50/user."
There's no indication that anyone who was there was shocked or surprised at this statement. Instead, it seemed like it was presented rather matter-of-factly, like it was common knowledge.