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now i know why facebook has been doin this. http://i.imgur.com/zPapJHM.png

"alt" is what's read out by screen readers, or shown when an image fails to load (you'd see this a lot in a high latency connection).

I believe that was for accessibility reasons, ie screen readers.

but it also allows you to do the opposite things, like search for "sky" and find that image.

didn't know that, cool!