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Sure, there's a place for self-promotion, but history suggests overhyping your business can backfire. Whether it was your third-grade teacher, your beloved granny or your mom, someone probably told you to keep a good head on your shoulders and not get too cocky. Self-confidence is great, they probably said, but a reasonable amount of humility is important for both mental health and maintaining solid relationships

Instagram CEO Kevin Systrom talks to Fast Company about opening up his API to Hipstamatic and the risks and rewards of opening up to even more photo apps in the near future. Today, Hipstamatic is set to unveil a partnership with Instagram that allows photos from the camera app to be directly ported to Instagram.

"The vision for our company is to make killer mobile entertainment that touches the real world," says Booyah CEO Keith Lee. Booyah is a fast-growing mobile gaming company that's poised to be a leader in the space.

In just nine months, the photo sharing startup hit 150 million pix and more than 7 million users who upload about 1.3 million photos daily (15 per seond).

"We're out to fundamentally change the way people communicate and share, not just create a pretty photo-sharing app," says Instagram CEO Kevin Systrom.

Just after midnight on October 6, 2010, Kevin Systrom signed into his Apple App Store control panel. "Here we go," he thought. With a click, Instagram , the photo-sharing app he'd created with Mike Krieger, was open to the world

Kevin Systrom launched popular photo-sharing app Instagram in October--and already it boasts around 5 million users. By comparison, it took years for startups such as Facebook and Twitter to reach that growth