Social media

According to most associated with the Indie publishing industry, social media is supposed to be the way to sell books. I am not much of a techy and have only recently been using Facebook to promote my work. I am told Twitter is the way to go, but not familiar with that system at all. I want to sell my books, but I don’t have hours and hours to devote to tweeting and retweeting. I have found sites where I can hire people to do this for me, but that costs money, which I have little to spare on my disability income. It is a vicious circle. Has anyone found a good system yet? I am going to start blocking a few hours each day to devote to social media marketing to see if this helps. It takes away from my writing time, but if I am not selling, why bother writing? Vicious, vicious circle!