Google security researchers say that hackers spent at least two years targeting iPhones “en masse” and placing “monitoring implants” on Apple’ssmartphones. The implants possessed the ability to steal private data such as iMessages, photos and GPS location in real-time, according to the Google researchers. In a blog post on Thursday, Ian Beer of Google’s security research team Project Zero said that hackers exploited iPhone vulnerabilities to surreptitiously place the implant on…