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.