"There is no mistaking a real book when one meets it. It is like falling in love, and like that colossal adventure it is an experience of great social import. Even as the tranced swain, the booklover yearns to tell others of his bliss. He writes letters
about it, adds it to the postscript of all manner of communications, intrudes it into telephone messages, and insists on his friends writing down the title of the find. Like the simple-hearted betrothed, once certain of his conquest, “I want you to love her,
too!” It is a jealous passion also. He feels a little indignant if he finds that any one else has discovered the book, too."
By going to "Books & people" and selecting "Browse members", it shows that Hong Kong has 256 registered members. It's likely that some of these aren't active, though. When you have found Hong Kong under "Browse members", you can click on "Hong Kong" to get up this list: http://www.bookcrossing.com/---/7/ Then select a region to see the members in that region.
Welcome to Hong Kong! Are you studying or teaching at CUHK? I was a student there!
The BC group in Hong Kong is rather small, though there are activities similar to BC and Little Free Library in different locations. The BC group does meet occasionally - like once every year or two - over tea or dinner. We also have a WhatsApp group too, you can pm me your phone number and I'll add you.