Square, Inc.
Dorsey developed a small business platform to accept debit and credit card payments on a mobile device called Square, released in May 2010. The small, square-shaped device attaches to iPhone, iPad or Android devices via the headphone jack, and as a mini card reader allows a person to swipe her or his card, choose an amount to give to the recipient and then sign his or her name for confirmation. Square is also a system for sending paperless receipts via text message or email, and is available as a free app for iOS and Android OS. The company grew from 10 employees in December 2009 to over a hundred employees by June 2011. Square's office is located on Mission Street in San Francisco's South of Market neighborhood. In September 2012, Business Insider magazine valued Square Inc. at $3.2 billion.
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