LinkedIn going the facebook way?

I got a LinkedIn invite from someone whose name was vaguely familiar,
but did not really recognise. So I asked her "who are you and how do
you know me"?

Her reply:

> sorry sir we dont know each other....i think i have got u from my gmail
> where i usually forward my resume for jobs.

Is this how networks are built up now? Is Linkedin becoming like bloody
facebook?

Is this how some people have hundreds of contacts?