By default, your Lifebook content is tied to your account. The book view uses a URL that includes your username—treat that link like any shareable URL: anyone with the link may be able to view what you’ve published there, depending on your settings and implementation.
For maximum privacy, avoid sharing your book link publicly unless you intend to. Premium positioning may include additional privacy emphasis; check in-app labels and your Profile for the latest visibility options.
We do not sell your personal tracking data to advertisers. Use a strong, unique password and enable social login only from accounts you control.