We've already had a number of posts about Square , the new mobile payment platform launched by Twitter creator Jack Dorsey today, but we're going to keep posting on it, because it's just that good. Most of the earlier stories covering the launch of Square included a screenshot of an example receipt that is displayed on Square's site right now. The actual receipt doesn't quite look like that, but it's close. I know this because I actually used Square today to buy myself and Dorsey coffee at Sightglass, which is already using the payment system. I made the purchase at 8:47 this morning and the receipt was immediately emailed to me in the form of a link to a Square page. On this page is a receipt featuring the logo of the vendor, their email address, and their Twitter handle. Below that, it shows the amount and the exact time of purchase. And below that is a Google Map of where the transaction was made and your signature.