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This relates to something I noticed recently. Out of the blue, I started receiving "join my network" requests from people whose names sounded vaguely familiar. I couldn't remember ever meeting them, and their profiles didn't give me any clues as to where I might know them from. I searched the inbox of the email account associated with my LinkedIn profile, and it turns out that they were all people I had contacted about items for sale on craigslist.

So, I'm guessing that my address was somehow added to their address books, which they then imported, and that's how LinkedIn identified out "connection". What that doesn't explain, though, is why these invitations were sent out. I'm confident that none of these people would have knowingly sent an invitation to me, so I'm guessing that LinkedIn is obtaining their "consent" without making it clear what is going on.

If anybody understands the process behind this, I'd be glad to know. The sad part is that once I realized who these people were and that they almost certainly didn't intend to send invitations to me, I didn't bother to investigate any further, because that's the kind of thing I've come to expect.