Answer:
This statement implies that the only form of entertainment or excitement in the lives of the general public then, was through keen observing of the social life of the prominent and rich. They saw in the life of the prominent through their imaginations what they wished their life to be like.
Step-by-step explanation:
In the context of the text leading up to the statement, one can understand that the various entertainment options available to those of of is living in the 21st century was not available then during the time of the Titanic's sinking. According to the text, the "Titanic was also the last stand of wealth and society in the centre of public affection. In 1912 there were no movie, radio or television stars; sports figures were still beyond the pale; and café society was completely unknown".
So, the social lives of the rich and prominent served as the only source for imaginative thinking of the general public, of what living a good life would be. There was keen interest among the public, about the lives of the rich and prominent who were on the Titanic. Even after its sinking, the events in the Titanic still continued fascinating and interesting the public.