I think you’ll find this rather slick:

Now, with Google Photos, you pick the photos, tap “share” and select the people you want to share with, instead of the apps—and we take care of the rest.

• If your friends are on Google Photos, they’ll get a notification.
• If you share via phone number, they’ll get a link to the photos and videos via SMS.
• Email addresses will get an email with a link from Google Photos.

So you can spend less time toggling from app to app to share photos — dealing with failed texts or email attachment limits along the way — and more time enjoying life’s photo-worthy moments.

[YouTube]