Companies you may have no relationship with can receive information about you and your guests from the camera on the doorbell on your front door. This is in addition to the ability for law enforcement to access your video and employ facial recognition software without your permission (see earlier posts, Feeding the surveillance state from your doorstep, and Ring cameras part 2).
“Facebook, via its Graph API, is alerted when the app is opened and upon device actions such as app deactivation after screen lock due to inactivity. Information delivered to Facebook (even if you don’t have a Facebook account) includes time zone, device model, language preferences, screen resolution, and a unique identifier (
anon_id), which persists even when you reset the OS-level advertiser ID.”
[from the EFF]