Apple's Senior Vice President for Worldwide Product Marketing Phil Schiller has always been a sociable guy, and now he's begun actively using the Twitter account he set up (but rarely posted to) two years ago, 9to5 Mac reports. Using the verified account name @pschiller (there are many other fake "Phil Schiller" accounts), since the end of October he has been making regular entries, often posting pictures using Instagram, a popular photo-manipulation and sharing app for the iPhone, as discovered by TechCrunch.