Not too long ago learning about spending and saving as a child meant putting extra money in a piggy bank and figuring out how to balance a checkbook. Now the growth of the online marketplace presents new hazards for children and teenagers most of which go undetected by parents. Smartphones and the expansion of mobile networks in particular have become a double-edged sword. Children can access the Internet more easily but parents have to worry about their children releasing personal and financial information to cyber criminals.  Until two months ago the Children's Online Protection Policy Act or COPPA which ...