The rule was proposed by TA McCann from Gist.com and is a rather simple and genius idea. Out of 10 social media posts:
See what’s missing? The sales pitch! Too many business people who use social media are too sales-y. Give your audience what they want, whether it’s an article to read or an inspirational quote. You don’t want to be constantly promoting you and your own company. This can annoy your audience quickly. If they’re interested in the content you’re putting out, they’ll have a more positive reaction to your company and the product or service that you are providing.