LinkedIn can be a very powerful tool for businesses. This is generally more true for B2B businesses than B2C businesses, but the above applies to both situations. If you just connect and talk with people, that's great, but that's not fully taking advantage of the medium. There are many things you can do on LinkedIn to boost awareness of your business, like optimizing your profile for LinkedIn search and participating or starting a group.
You can also advertise on LinkedIn, and since there are a hundred million professionals there, you are pretty much guaranteed your target audience will get your message.