When life gives you lemons, you make a lemonade stand — and use the profits to free more than 500 child slaves, of course.

Vivienne was only 8 when she saw photographer Lisa Kristine's image of two young Nepalese brothers carrying heavy stones down a mountain. When she learned that these boys were slaves, she immediately decided that she wanted to end child slavery. So in May of 2012, she did what many kids do, and set up a lemonade stand near her home in Fairfax, California, except the money she earned didn't go towards candy and toys. She charged "Whatever's in your heart" and gave all proceeds to charities fighting for her cause.

As word got out about her mission, Vivienne continued to sit at her increasingly popular lemonade stand every day, and in December, New York City Mayor Michael Bloomberg invited her to sell her lemonade in Times Square. By the end of the day, she had raised $101,320.

She told her parents that she wasn't going to stop until child slavery no longer existed, and they decided to help her turn her cause into a real company called Make A Stand.

Vivienne has nearly 23,000 followers on Twitter and, with the help of her social media-savvy family, has used the platform to launch the brand and attract national attention to her cause.  Vivienne achieved fame by ringing the bell at the New York Stock Exchange last November, when Twitter went public. Vivienne was chosen by Twitter for the honor because of her lemonade stand.