Square Seth Wenig / Associated Press A businessman displays his Square credit card reader. (Seth Wenig / Associated Press) Paresh DaveContact Reporter San Francisco mobile payments start-up Square filed to go public Wednesday, meaning it could soon test whether investors will back a highly-valued, money-losing tech company whose chief executive also runs social media company Twitter. Square is one of more than 100 tech companies that in recent years have been valued at more than $1 billion in private financing despite not producing a profit. In a Securities and Exchange Commission filing, Square said losses jumped to $154 million last year on $850 million in revenue from about $105 million...
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