These sites don’t always work the desired way.
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Here’s a graphical representation of the same: Along with the popular social networks, a few adult websites and advertising networks made it to the list. According to research conducted by OpenDNS, the sites that are frequently blocked in educational and work organisations include Facebook, MySpace, YouTube, Twitter, Doubleclick, YieldManager, Limewire and a few other websites. Blocking or preventing users from accessing social media sites like Facebook, Twitter and video streaming sites like YouTube and Vimeo is a common tendency prevalent in almost all the workplaces, schools and colleges.