How to promote your business through LinkedIn

Gain visibility: Make a well-framed profile so that people want to connect with you. Remember that connecting with more profiles means easy search of your profile(business). Join business related groups and participate in the discussions. Give suggestions and get recommendations. Giving advice states that you have a professional expertise in your domain. If you have a well-framed profile on LinkedIn, you can get connected to many people and hence promote your product.

Participate in joined groups: Get alive in the joined groups by posting content in those groups, responding to the posts, connecting with different members of the group etc. This will help you make new connections. Join LinkedIn Groups which provide an opportunity to network with people from same background.
http://www.redalkemi.com/articles/linked-in.php