According to WhatIs, "Alt text (alternative text) is a word or phrase that can be inserted as an attribute in an HTML (Hypertext Markup Language) document to tell Web site viewers the nature or contents of an image. The alt text appears in a blank box that would normally contain the image."
If you been posting pictures to Facebook, it is interesting to note that Facebook has been using an automated tool to write the alt text of your pictures for you and it's scary good. The below are a few examples of the alt text that was automatically generated on some of my pictures.
"One or more people, phone, beard and selfie"
"1 person, smilling"
The above are but 2 examples from my Facebook account but every pictures I've seen had one and the accuracy of it is borderline scary.
I'm not very comfortable about having applications scan and understand my pictures. This technology, in the hands of the wrong people, could be used to find incrementing pictures of you online or on your personal computer.
Perhaps this is, again, a reminder of being careful what we post online or what we keep on our computers.
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