You produce revenue through your usual business activity, by making sales, getting your invoices paid, or taking cash from paying customers.
Once upon a time - as all good stories go - Apple was 2 blokes in a garage in San Francisco. It was 1977 and their computer was made of wood! Just over 40 years later Apple has 132,000 employees world wide, and last years turnover was US$265.595 billion dollars.
LinkedIn, is it really a business tool? Have you gone through all the motions, set up your profile, had people ask you to connect, connected with them and then that’s it.