Our entire eighth grade class got their's at once. A "class" project. Assignments included memorization of them the next day! We had two classmates whose numbers were one apart.

It's amazing to me that babies get them before they leave the hospital!

On another note, our original tab from our first cards specifically said "Not to be used for identification"....that we were only to give them out if we were going to get paid. So, I do not give mine out unless absolutely necessary.
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