Nobody wants to get a computer virus and, for the most part, we try to stay away from places that could be risky.

The problem is that the sites listed here are some of the most commonly used sites on the net.

Unfortunately, some of the most dangerous places are very commonly used. According to WatchGuard security researchers, here are 4 sites you might think are perfectly safe.

Facebook: Yep, good old Facebook. Why is it dangerous? Well, it's a numbers game.With so many millions of users, it's fertile ground for hackers. In fact, according to Watch Guard, it's the most dangerous site around making it number one on our list.

Twitter: Another seemingly benign site that could spell disaster for your computer. Now, you probably wonder how a site that limits us to 40 characters could be such a dangerous place to play. According to Watch Guard:

  Twitter’s short form posts lead to new vulnerabilities such as URL shorteners, which can also help hackers hide malicious links. Twitter also suffers from many Web 2.0 and API related vulnerabilities that allow various attacks and even Twitter worms.

YouTube: Once again it's super popularity makes it a natural for on-line predators.That adorable video of cats at play can contain malicious web pages disguised as video pages. Also, watch out for the 'comments' section. Hackers love to hide infected links in there.

LinkedIn: Hackers are naturally drawn to Linkedin. Why? Well, mainly because it's a business based site and hackers do love messing with businesses. Be careful what you post on Linkedin. Sometimes people looking for a job using that source give a bit too much personal info. It doesn't take a lot of personal information to have your identity stolen.