It's pretty simple process that LinkedIn was founded upon and unfortunately it doesn't seem to work that way too often. Referrals, introductions and recommendations......not cold calls. Sorry if that seems rude but you can always LIKE me on Facebook if you prefer. Here is an clip from a book I have been reading, "Never Eat Alone" by Keith Ferrazzi that outlines my same thoughts.
Keeping things simple. One of the few times I actually follow the rules.