Topping tech headlines Monday, Code.org kicks off its "Hour of Code" program, the thinner Square Reader offers better performance, and Facebook considered a 'sympathize' button.

Update: Square has provided us with the following statement on the matter, stating that its products have special security measures and that the described problems are more of an industry-wide issue: ...

The Square Reader has helped lower the barrier to entry for many small retailers keen to take payments on card. Now, though, new research reveals that it’s possible to turn one of the readers into a ...