Even if you don't state your ethnic background anywhere on LinkedIn or whether you are married with children, a scan of your photos and other people's photos featuring you will make it far easier to deduce.
China in particular is an absolutely fascinating place to be. Culturally and politically and economically it's becoming more and more relevant. If you look at how China is perceived in different parts of the world, you can recognize it's very dynamic. It's also challenging what it thinks of itself.
The ability to identify someone at a moment's notice by snapping a photo of him or her, to trigger an immediate influx of data about the person behind the face, will forever change the world.
Many retail stores have consumer trackers that study how long your eyes linger on one product, whether you follow it through by touch, and things that you buy. You can redesign things on a shelf, all by tracking such information.
Facial recognition software is already quite accurate in measuring unchanging and unique ratios between facial features that identify you as you. It's like a fingerprint.
Tokyo - still - offers the most tightly integrated infrastructure, where smooth, technology-driven experiences take place when engaging in everyday actions, such as verifying personal identity, paying for goods, and buying tickets.
