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Just a fun fact:
Facebook posts some of the information that it automatically derives from user pictures in the alt field of the pictures.
Below we post two samples from a stream that demonstrating this feature:
In the first one we can read in the alt the following Image may contain: 1 person, smiling, closeup.
In the second one we can read in the alt the following Image may contain: 1 person, sitting, pool, sky and outdoor.
We can see that in both cases the information is pretty much valid.