What is the fine-grained topic of the following text: As a mysterious pirate ship, Sailing Yacht “A” is the most photographed – instagrammed – ship this summer, an icon of the sea that has been attracting spectators and yacht enthusiasts, involving them in fun activities on the social media, especially on Instagram, and fascinating everyone as a magic and mysterious ship, suddenly appeared on the horizon. Only return the topic.
The popularity and intrigue of Sailing Yacht "A" on social media, particularly Instagram.