Back in December 2011, TripBirds was one of many (many, many) so-called social travel sites, created so users can get tips from their friends using the social graph.
The Stockholm-based startup had $750,000 in investment from the likes of Index Ventures, Passion Capital and Creandum (as well some high profile angels) when it launched and was lauded as the hottest startups in Sweden by Wired magazine.
It collected data from a user’s friends from their activity on Facebook, FourSquare, Gowalla (RIP) and Instagram, and allowed them to interact and ask questions, etc.
Read full story at: http://www.tnooz.com/2012/08/28/news/tripbirds-swaps-travel-tips-platform-for-social-media-led-hotel-booking-service/