Please note that I have closed my LinkedIn account. This is because I needed to block certain people, but, unlike Twitter and Facebook, it is not possible to block people from LinkedIn. The LinkedIn network is simply not important enough to me for me to jeopardize mine and my family's security.
Until LinkedIn can install this basic security measure, I have to recommend people not to participate in the network.
Oh, dear! I'm sorry. I've just been getting into LinkedIn and will have to look into these risks.