What with it being lunchtime I did some searching on this. Apparently phstamp was recently introduced by FaceBook (note, I'm not a FaceBook user) to verify each request. I suspect they don't want you automating FaceBook via such methods, I'm pretty sure they'd have something in their conditions of use against such behaviour.

In reply to Re^5: Completely puzzled in creating content for post method of mechanize module by marto
in thread Completely puzzled in creating content for post method of mechanize module by ckj

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