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Unfortunately, it is not illegal, as in against any specific criminal law.
The only type of prohibition against that would be a stretch, and that would be claiming that the text was copyrighted and thus posting it is in violation of the copyright laws. Likely if you make that claim to Facebook then they would remove the post since they claim to be cracking down on copyright and trademark violations.
However, I have never seen the copyright argument made in a situation like this, even in case law, but in theory it should work if you want to devote the time and effort to pursuing it.