Makes more sense for Google to buy them. They could do two things with them:
1: build the technology into their Google Glasses so peoples names pop up as they come into view
2: redirect face.com to Google.com.
That second option would be well worth the 100 million too. Consider this: after you visited face.com once every next time you want to go to facebook.com and type in 'face' your browser will auto-complete to face.com
Doesn't Face.com have an API? I think the active users of that would be upset if all the documentation/etc. for it just disappeared and started redirecting to Google.
More to the point, a free API. I can't see Facebook or Google keeping the API around if they acquired Face.com, which would be very sad. Of course, it would be a technology rather than a user acquisition, so I don't suppose whoever was buying would care that much.
Makes more sense for Google to buy them. They could do two things with them:
1: build the technology into their Google Glasses so peoples names pop up as they come into view 2: redirect face.com to Google.com.
That second option would be well worth the 100 million too. Consider this: after you visited face.com once every next time you want to go to facebook.com and type in 'face' your browser will auto-complete to face.com
1 and 2 are both interesting scenarios.