Lately I've been receiving a lot of LinkedIn invitations from people I do not know with the generic "I'd like to add you to my network" message and nothing else. This just isn't doing it for me. Maybe I should know you, but without a compelling message, it's hard to make that decision. And please don't take the easy way out and assume I will click on the link to your profile. Explain in the body of your email why I should connect to someone I don't know and what the possible professional synergies are. That will capture my attention and make you much more credible in my eyes.
LinkedIn users should stop mining data and start creating authentic relationships on-line that can eventually lead to valuable professional partnerships. That's the way to optimize its value.