Hackers are a company's best last line of defense, and paying them to find security vulnerabilities is an increasingly common practice among all manner of companies, from Uber to GM.
Users visiting the websites of the New York Times, Newsweek, BBC and AOL, among others, may have installed malware on their computers if they clicked on the malicious ads.
In light of the recent hacks of high profile companies and individuals, entrepreneurs would do well to understand and maximize their online protection.