I've been deluged with junk mail recently. I'm pretty careful about where I send my email address. Then someone tipped me off to the privacy changes in LinkedIn. I started going through all the privacy settings and fixing them - it took a while to find them all. But I have them all set properly, and the spam has mostly stopped. I can't guarantee it was caused by LinkedIn, but circumstances suggest that it was.
LinkedIn, you aren't doing yourself any favors by exposing your customers to a bunch of crap. As I've asked before, when did "social media" come to mean "spam?"