The key to selling to business is to figure out the purchasing process at the businesses you want to sell to. This will vary substantially depending on the industry, the size of the business, and the cost of the software.
In my opinion, you are not going to appeal to business users via Linkedin, or anything similar.
If you have developed (or are developing) a solution aimed at business users, I suggest that you find a handful of pilot users you can speak to, and ask them about their purchasing process, and for advice about how you would sell to similar companies.