We do NOT sell or rent any customer information to third parties.
Obviously, if you grant estate access to other users, they will be able see the data to which you give them access.
In order to optimize the user experience, we work with Google to collect non-personally identifiable information such as feature usage and page views when you visit the website. No estate data is shared.
Similarly, we work with Facebook to optimize our advertising there, never sharing any estate data. You can disable Facebook tracking via their Settings & Privacy > Settings > Off-Facebook Activity menu.
Finally, note that if you have supplied us an email address, we may infrequently send you an email to let you know of an important security issue or product upgrade, and may use a third party to facilitate the delivery of any such emails.