Brooke Hammerling, the founder of Brew Media Relations, says she created her own firm because she got sick of a mix of dismissive tech guys and sexism inside some companies.
Twitter made its debut on the New York Stock Exchange in November. Both the social media giant and the relative newcomer Snapchat are valued in the billions, but neither company has yet turned a profit.
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Kenyan Susan Oguya created an app to help farmers in her homeland. Shown here in the office of her company, M-Farm, she also belongs to the group Akirachix, which seeks to bring more Kenyan women into the tech world.