Then opt out. This happens on any social network in which you have a public profile that gets a lot of exposure. Hell, my brother who works at Google explicitly

Then opt out. This happens on any social network in which you have a public profile that gets a lot of exposure. Hell, my brother who works at Google explicitly lists Google as his employer on his public G+ profile, and he's been added to thousands of peoples circles who he doesn't know. If you aren't interested, then there is an email preferences setting tab that you can easily customize what gets sent to your inbox (https://www.linkedin.com/settings/?trk=hb_acc https://www.linkedin.com/settings/?trk=hb_acc). LinkedIn is the only social network that I've had and will continue to keep, since it's focused on one thing -- professional networking.