Linked In has started a “feature” that links your address book contacts. I won’t turn it on because I don’t want them contacting people without my knowledge.
I don’t either.
That’s not the way it works. It uses your contacts to see of those people are on LinkedIn and offers you the ability to connect with them. It doesn’t do it automatically.
I don't like that feature either. I don't need to have everyone I have ever sent an email to, to suddenly getting request.
I get a lot of phishing emails from non-LI people requesting a connection. I always make sure that I am actually logged in to LI and review the requests from there.
It's a handy tool, as long as people don't try to make it into Facebook, although I call LI, "skynet". :-)