One of the first companies I blogged about was group booking specialist Groople. In posts on them and other targeted booking providers I have mused about how it will be challenging to obtain and maintain scale focused on a very niche section of the market. Themarket has also become very competitive for group travel with the likes of TripHub also entering the market (here is my interview with John Pope of TripHub).
You will recall that TipHub enables groups of people to share information about about a trip. In a recent announcement Groople are planning similar planning abilities such as clone itineraries, themes for groups and event scheduling. TripHub may have followed Groople into the group market but Groople is now following TripHub into social networking.