This is not free! You have to spend your valuable time on social media. However, you can look for an employee towards the social media or you can search any company who providing Social Media Marketing Services.
There is always a cost; hence, the key is to get maximum ROI (Return On Investment) out of the time or money you put into it. However, that ROI doesn’t have to mean revenue. It can, but also mean meeting other objectives, like getting new leads, improvement email subscriptions, etc.