Phil Schiller, Apple's Senior Vice President of Worldwide Marketing, doesn't post to his Twitter account very often. Mostly he has written innocuous messages wishing followers "Happy Christmas" or cheering on the world champion San Francisco Giants. Today, Phil tweeted a link to a 'Mobile Threat Report' from research company F-Secure. Most of the report highlights security and malware vulnerabilities in the Android operating system, while mentioning only a couple of iOS issues. He warns followers to "be safe out there". Be safe out there: