How many times have you happened to get on certain sitethat will virus computers? Probably (very) often. But if you could avoid gender sites, thus giving you systems?
WOT (more accurate Web of Trust) is one add-on (created by Against Intuition Inc.) who warn users in relation to sites with bad reputation allowing them to safety safety pe internet.

WOT combina experience and rating of users SAI (only trust rats are selected) with Sources of independent rating of them (lists of sites with risky content), currently ~ 21 million sites being "labeled" on these criteria. Integrates ok in most search engines and has "friendly relationships" with Firefox/Flock and Internet Explorer.
Overall, WOT brings something new in this field of Internet security and parental control and, despite the fact that it is just a simple extension for Firefox or Internet Explorer, it does a great job. It can be improved and hopefully it will be.