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I think that's a bit of an exaggeration. From what I've heard, all the cases of people sharing private files have been due to the user explicitly selecting their personal folders, or entire drives, for sharing.
I don't know much about the older proprietary clients, which I wouldn't touch with a bargepole, but I don't think something like eMule is particularly insecure. The real problem is people that are willing to run or install unknown software willy-nilly. The example above is a case in point, nothing bad happens in downloading the file, or attempting to view it, it's installing the codec/player that causes the problems.
I suspect that if you were to look at modern infected machines you would find that 90% had been used on social-networking sites; it doesn't imply a causal relationship.
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