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There are a couple of things that you can do that are really easy and will greatly decrease the risk while people are browsing. I install the NoScript plug-in on all the browsers at my office. We currently use Firefox, but I'm sure there is either a version of it for Chrome or a similar plug-in. The most effective thing that you can do, in my opinion, is disable Flash. If that generates too many complaints, at least make certain the most current version of Flash is installed and change the global security settings to "always deny" or at least "always ask". There is also a setting in there to deny access to your machine's cam and mic.