Just for the record, About.com does not do unpaid training. They have a 2-week prep period, which is more like a tryout (for lack of a better word) and then may offer the job to you. Once you are hired, you are paid; there's no continued work for no pay. I don't think that sounds like 4 weeks of unpaid training to me, especially since your About work is not going live during the training period, and you retain all rights to it.
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