That depends on what you're selling. Some products and services do not easily lend themselves to selling through social channels. If you're looking for direct sales through channels such as Facebook, it's possible you may be looking in the wrong direction.
Social channels are often good for marketing -- awareness, perhaps even lead generation. But there are relatively few products or services that can be easily sold through social media.
Particularly in Facebook, they do not give wide "reach" to sales pitches. Why should they? If you want to sell in FB, they want you to pay for ads. Even informational articles from businesses don't get as much "reach" these days as they used to. Posts that are obviously trying to get somebody to buy something will usually be shown to very few of your followers.
Of course, if you have tons of followers, even a small percentage of them might still be a respectable number. But these all have to be real human followers who signed up to follow you because they are truly interested in your business and in what you offer. Fake "purchased" followers will never help you when it comes to selling anything.
If you're not willing to try paid advertising, your best other option is to focus your social media efforts on marketing instead of direct selling. Post interesting or thought-provoking articles designed to drive people back to your website where the actual sales process can take over. Share the articles yourself and try to get some of your friends / colleagues / employees to also share them to increase their reach as much as you can.
Either that, or cross your fingers and hope George Takei takes a liking to something you sell and reposts it to HIS followers.