More than 20 percent of Facebook News Feed links lead to viruses, according to ZoneAlarm. This number seems suspicious, but regardless of how high it is, here’s what you need to know. ZoneAlarm has released an infographic regarding Facebook security. The first part is straightforward and tells us a bunch of statistics we already knew: 800 million monthly active users, some countries have embraced Facebook more than others, 4 million users are hit by spam daily, and so on. The only finding the security company seems to offer based on its own research is this: “more than 20 percent of newsfeed links currently open viruses.”