Many of you know of Jack Dorsey as co-founder and CEO of Twitter. What you might not know is that Dorsey is also the founder and CEO of Square. The latter is a financial services company that allows a smartphone to be used as a mobile credit card processor. For example, let's say that your air conditioner is on the fritz. The repairman comes and needs to charge you $500 for the work. Instead of calling in the customer's credit card info to the office, the repairman whips out his phone, plugs the Square into the handset's charging port, swipes the card through the Square unit, and receives ...
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