People value practical information and share it, whether it's a news article on how to save a few bucks or a website that can help you with your business, like Shopify. We share to help others and in an era where face to face helping (like barn raising in the old days) is becoming harder because of our online ways, sharing via social media has again given us the opportunity to help others.
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Social media giant Facebook conducted a psychological experiment on hundreds of thousands of it's users - manipulating their emotions by delivering negative and/or positive items into those user's newsfeeds in an attempt to see if emotional states are contagious