Answer:
Socially Responsible is a wide concept that embraces many different answers. One of the most interesting answer to this questions is Robin Travels with his LivingAmsterdam.com.
They are more focused on economic aspect of this business rather than the environmental one.
LivingAmsterdam.com is online booking site for hotel, apartments and b&b in Amsterdam (they are still small but growing). The money earned with the booking site are redistributed to educational projects in developing countries. Robin Travels select and monitor the schools in order to guarantee financial and educational tranparency.