What in Peanut Butter dissolves glue?

There is a common belief that *Peanut Butter* can dissolve certain types of glue. I've tested it and it does on a few common stickers. A forensic science crime procedural TV show (Bones) made a statement that 



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> The oils in the peanut butter will break down the cohesion of the cyanoacrylates.
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The most common cyanoacrylates based glue is Super Glue, which hardens quickly.


How does Peanut Butter interact chemically with the CA glue and why? Does it make a difference when the CA has hardened or not?


