Facebook introducing face recognition

I saw this message just now in my profile:

Introducing face recognition for more features
Hi, xxxxxx. We're always working to make Facebook better, so we're adding more ways to use face recognition apart from just suggesting tags. For example, face recognition technology can do things such as:

• Find photos you're in but haven't been tagged in
• Help protect you against strangers who use your photo
• Tell people with visual impairments who's in your photo or video

You control face…

Facebook introducing face recognition