I have similar...
I signed up and was amazed at the people that were suggested automagically by linkedin. There were people I had dealt with years ago but haven't contacted in any way for 6 or more years... and the reason I knew them then is not related to my work.
It's like linkedin has access to the entirety of my on line history.
Not long after I had the account I began getting invites from a bunch of local people, two of whom were fired by their employers for various reasons. (one of them has been fired out of every job he's had since I've known him)
I did not accept the invites, and after about a dozen or so from each one of these people the invites finally stopped. My "excuse" is that although I signed up I really don't use linkedin for anything, which is true.
I do plan to figure out how they know so much about us, so I will be using it a little.
