Gravatar Hovercards
Data Used: This feature will send a hash of the user’s email address (if logged in to the site or WordPress.com — or if they submitted a comment on the site using their email address that is attached to an active Gravatar profile) to the Gravatar service (also owned by Automattic) in order to retrieve their profile image.
Infinite Scroll
Data Used: In order to record page views via WordPress.com Stats (which must be enabled for page view tracking here to work) with additional loads, the following information is used: IP address, WordPress.com user ID (if logged in), WordPress.com username (if logged in), user agent, visiting URL, referring URL, timestamp of event, browser language, country code.
Activity Tracked: Page views will be tracked with each additional load (i.e. when you scroll down to the bottom of the page and a new set of posts loads automatically). If the site owner has enabled Google Analytics to work with this feature, a page view event will also be sent to the appropriate Google Analytics account with each additional load.
Mobile Theme
Data Used: A visitor’s preference on viewing the mobile version of a site.
Activity Tracked: A cookie (akm_mobile) is stored for 3.5 days to remember whether or not a visitor of the site wishes to view its mobile version. Learn more about this cookie.
Notifications
This feature is only accessible to registered users of the site who are logged in to WordPress.com.
Data Used: IP address, WordPress.com user ID, WordPress.com username, WordPress.com-connected site ID and URL, Jetpack version, user agent, visiting URL, referring URL, timestamp of event, browser language, country code. Some visitor-related information or activity may be sent to the site owner via this feature. This may include: email address, WordPress.com username, site URL, email address, comment content, follow actions, etc.
Activity Tracked: Sending notifications (i.e. when we send a notification to a particular user), opening notifications (i.e. when a user opens a notification that they receive), performing an action from within the notification panel (e.g. liking a comment or marking a comment as spam), and clicking on any link from within the notification panel/interface.
WordPress.com Toolbar
This feature is only accessible to registered users of the site who are also logged in to WordPress.com.
Data Used: Gravatar image URL of the logged-in user in order to display it in the toolbar and the WordPress.com user ID of the logged-in user. Additionally, for activity tracking (detailed below): IP address, WordPress.com user ID, WordPress.com username, WordPress.com-connected site ID and URL, Jetpack version, user agent, visiting URL, referring URL, timestamp of event, browser language, country code.
Activity Tracked: Click actions within the toolbar.