The most successful leaders in any field don't see themselves merely as managers. They see themselves as the leaders of movements that rally people around common purpose to accomplish big things. Here are the keys to becoming a movement starter.

Jennifer Dulski, the head of Facebook Groups, has been a startup founder, a tech executive, and president of Change.org. She has been the mastermind making change in both the business and activism worlds. And though they may seem diametrically opposed in their missions and methods, Dulski argues that the best leaders in both fields share one crucial trait: they lead movements. Whether you're at a startup or a political campaign, a Fortune 500 company or a local community group, you can turn a mission into a movement by helping others believe that they have the power to change the world.

Dulski teaches readers to accomplish huge goals by tapping into their visions and inspiring others to join the cause, as she has done at as an executive at Google, Yahoo!, Change.org and Facebook. Now she pairs her experience with stories of movement leaders from both the business and activism worlds. Their passions and origin stories vary widely, but Dulski distills the common themes from these change-makers' experiences into a few key takeaways. For instance:

Passion is an equalizer: Sharing your passions can cut across hierarchy and difference to inspire others. Founder of Drybar Alli Webb was a stay-at-home mom passionate about helping women feel good. That belief helped Drybar grow from a two-person business to a $70 million company in just nine years.

Ask why not me? instead of why me?: Ordinary people can move mountains. When she was 17 and went bra-shopping with her 13 year-old sister, Megan Grassell became frustrated that only overtly sexual bras were available for young girls. In response, she founded Yellowberry, which is now a thriving business and movement to empower young girls.

Encourage others with vulnerability: openness about your struggles catalyzes deeply human connections that can inspire and persuade others. Dulski's own journey to write this book began when she shared the story of her daughter's serious illness in a keynote speech, and found an enormous response from the audience.

This is an invaluable resource for all would-be leaders who want to make an impact on the world.