↑ Google's insistence on real-name policies for Gmail and Youtube accounts, along with strict measures to prevent signing up via Tor, have significantly contributed to user profiling. Google has also dropped its ban on personally-identifiable information in advertisement services.
↑ Meaning Google applications continue to store time-stamped location data without user input.
- Personal information: Name, email address, and telephone number.
- Device-specific information: Hardware model, operating system, unique device identifiers, mobile network information.
- Log information: Search queries, telephony log information (phone number, calling-party number, forwarding numbers, time and date of calls, duration of calls, SMS routing information and types of calls), IP address, browser-specific cookies, and device event information (crashes, system activity, hardware settings, browser type, browser language, the date and time of your request and referral URL).
- Location information: IP address, GPS, and other sensors providing information on nearby services such as Wi-Fi access points and cell towers. It was recently discovered [archive] Google continues to track users even after they opt-out of Location History. 
- Unique application numbers: Information on application types and version numbers.
- Local storage: Storing personal information locally with local browser storage (like HTML5) and application data caches.