Let me perhaps bring this a little closer to home for you.
Let’s say someone posts on Free Republic the following:
“Donate to the Republicans, they’ll shrink the size of government.”
So I donate. And then they do the opposite.
Under your theory, Free Republic would be responsible as it “participated” in the scam.
Under common sense, however... you can see where this would all lead.
No. A politician not keeping his promise is a scam, but it is not prosecutable, i.e. not a crime.
What I'm saying is, the individuals making money off a website are more responsible for the criminal activity conducted on that website than any people who may have fallen for the scam. There are those on here that want to prosecute the people who believed the ad. Fine. . .AFTER you prosecute the website owners (and of course, the guy who posted the ad).