Even a tech giant like Facebook isn't immune to significant security breaches. Devcore's Orange Tsai recently discovered that someone had installed a backdoor on one of Facebook's corporate servers (that is, not the social network itself) in a bid to swipe workers' login details. While it's not clear how successful the script-based exploit was, Tsai noted that the file transfer app hosted on the server had several vulnerabilities that effectively gave any intruder free rein. The attacker could have checked employee email, for instance, or even connected to Facebook's virtual private network to get access to the company's inner workings.