Sadly, the face.com API is being shut down due acquisition by Facebook.
Are there any decent alternatives out there?
I'm looking to check for a given image if there is a face in it + demographics content about it.
Sad news indeed. If you have a good reason and already have an account, they may extend you until October, 2012: http://developers.face.com/extension-request/
For everyone else, here's a list of potential alternatives I've compiled:
The following are similar but more on the Augmented Reality (AR) library side for detecting objects or movement with a webcam only, but with some extending could likely be trained to detect faces in snapshots or uploaded images as well:
If anyone knows others, please feel free to add here to make this list as comprehensive as possible.
UPDATE (2013-08-20): Found this article the other day and thought I should add it here, though not sure how many projects listed there are still active: http://blog.mashape.com/post/53379410412/list-of-40-face-detection-recognition-apis