From the get-go, Sony’s PlayStation 4 has been selling well. It’s only been about a year and a half since it launched in November of 2013, but Sony announced today that the PS4 has sold over 25 million units worldwide. We still don’t know the exact number of Xbox Ones sold to consumers, but if the estimates are correct, the PS4 has now sold more units than the Xbox One and Wii U combined. ...