As the growth of social media, they have affected to every industry including hosipitaly and tourism. Consumers are now concerned about their experience and others'. They are not simply looking for a place for their vacation but also its offer for great experience.
The third party such as Tripadvisors has grown huge number of member for advice.
Sooner, there will be a trend for large and brand hotels approaching their customers directly without the appearance of ther thrid party anymore.
Via Maria Cristina Terenzio