Mary
"Your networks and connections.
We collect information about the people and groups you are connected to and how you interact with them, such as the people you communicate with the most or the groups you like to share with. We also collect contact information you provide if you upload, sync or import this information (such as an address book) from a device."
"We collect information from or about the computers, phones, or other devices where you install or access our Services, depending on the permissions you’ve granted. We may associate the information we collect from your different devices, which helps us provide consistent Services across your devices. Here are some examples of the device information we collect:
Attributes such as the operating system, hardware version, device settings, file and software names and types, battery and signal strength, and device identifiers.
Device locations, including specific geographic locations, such as through GPS, Bluetooth, or WiFi signals.
Connection information such as the name of your mobile operator or ISP, browser type, language and time zone, mobile phone number and IP address."
"Information from websites and apps that use our Services.
We collect information when you visit or use third-party websites and apps that use our Services (like when they offer our Like button or Facebook Log In or use our measurement and advertising services). This includes information about the websites and apps you visit, your use of our Services on those websites and apps, as well as information the developer or publisher of the app or website provides to you or us."
"We are able to deliver our Services, personalize content, and make suggestions for you by using this information to understand how you use and interact with our Services and the people or things you’re connected to and interested in on and off our Services. "
(my emphasis)