Are you talking about Linked In? Never heard of Linkden, not sure if that's a Jerryism or a real site! haha
I've never had an issue with LinkedIn.com... Sure, I get emails regarding those I've connected with, but that hasn't been half as bad as some other professional sites I mistakenly joined - one of the absolute WORST is jobs.com! I signed up just to apply for a position (that turned out to be bogus) and within 5 minutes I was spammed 6 times by them or their affiliates! I actually called the web site owner and told him to remove me from their list, and got four more spams from them offering half price to rejoin!! I never paid, but you have to pay if you want your resume posted, I opted out.