He’s the former co-founder of the social startup Loopt, which was funded by his current company — Y Combinator — in 2005 and acquired by the Green Dot Corporation in 2012. He’s Sam Alt
<img src='http://tctechcrunch.files.wordpress.com/2010/09/greendot.jpg' class="shot2" alt="" />There's a good chance you've seen prepaid credit cards on the shelves at 7-11, Walmart, CVS, Rite Aid, Ra