Why do you need LinkedIn at all?
I never saw the value in it.
And, yes, I am in business.
They look me up on Linkedin and I can see who they are and what they have done and who they know and search for relevant stuff.
I meet a lot of investors and in general people from all over the world and have been very happy with LinkedIn personally. It's the least intrusive social network I know off.
"You will not create more than one personal account."
I know a lot of people that don't look for jobs anywhere else already - spam ads are very rare.