Every day, you present something to strangers that is remarkably unique and that can be used to identify you.  Your face.

Ramifications of the new technology

The confluence of increased use of security cameras, and more effective facial recognition technology will have huge ramifications.
And for most of us, it’s too late to opt out. Any photo you have deleted from publically visible pages on social media has already been saved by internet scanners such as archive.org.
Never again will the public have an assumption of privacy.  Artificially intelligent “bots” will be able to accurately detect a person’s face using facial recognition biometrics that measures different aspects of a person’s face, and matching this to a database of “facial fingerprints”.  Machine learning technology makes it much easier for the bots to guess whose face it is (it doesn’t have to be an exact match), and do it with startling accuracy.  An example of this is the FindFace application, which allows you to you take a photo of a stranger and automatically find their social media profile.
 

Legislation will only be partially effective

Legislation may control the use of facial recognition technology by public and corporate institutions, but the highly effective technology will inevitably be used in unregulated ways.
Publicly posting a selfie of your face is the equivalent of posting a high-resolution image of your fingerprints.  A person’s facial characteristics can be made into a computer file that will serve as a digital fingerprint.  In the future, the entire world’s population “faceprints” will be able to be carried around on a USB stick.
Imagine if a government biometric database was hacked – and the biometric information, or even just the photos, was then distributed on WikiLeaks.  Any image of your face could be used to identify you – and fast technology will link this to all your public information online.

Privacy diminished

Government agencies will start to share these face databases.  All it takes is for one of these databases to be leaked to the public, and with a simple phone app, you will be able to match a photo to an identity.
Imagine a future where people regularly wear face masks in public to protect themselves from this facial recognition.  Doing so may become normal behaviour.  In future, government legislation may prevent people from covering their faces under the auspice of anti-terrorism laws, just like the current push against encrypted messaging.
References:
Privacy concerns voiced over photo database link to real-time surveillance
Does Facial Recognition Technology Mean the End of Privacy?
Let’s face it, we’ll be no safer with a national facial recognition database
We Built A Powerful Amazon Facial Recognition Tool For Under $10
DNA facial prediction could make protecting your privacy more difficult