Virgin Holidays and Contiki use various marketing strategies on their websites, blogs, social media, and other online platforms to promote their travel products and brands. These include creating internal blogs and engaging external bloggers to generate content, posting pictures on platforms like Pinterest and Instagram, using open-ended questions on Facebook to encourage engagement, producing podcasts and videos, and leveraging user-generated content through hashtags. The document provides examples of how these companies implement different digital marketing tactics and discusses the benefits of these approaches.