The story
HolidayCheck began in 1999 as a private hotel-review website set up by students in Konstanz, Germany, among them Markus Schott, Hakan Öktem, Jens Freiter, Jörg Kampshoff and Sascha Vasic. After the broadcaster RTL reported on the site in 2003, its founders registered it as a commercial venture, which began operating on 11 November 2003.
From Wikipedia’s article on HolidayCheck Group, shared under CC BY-SA 4.0.5