Hi Piotr

I find LinkedIn to be a powerful channel to market myself and my business. I have also gotten some good leads that found ME through a search on LinkedIn. I do limit the amount of personal data I put out there - no date of birth for instance :). I do have a company page but it doesn't get much attention.

As to their business model, they have things in place to get you to pay for their premium services. If you use LinkedIn to find prospects, for instance, you will find you soon exceed the free account search limits.