Of all the websites in the world, which would you guess are the top 10 most blocked? I’m sure there would be pornographic, religious, file-sharing, and other illegal activity websites on your list somewhere. But OpenDNS has come up with its list for 2010 based on real data, and the results are quite surprising.The most blocked website is also one of, if not the most popular destination on the web: Facebook. Some of the other nine entries may surprise you too:Facebook.com —14.2%MySpace.com — 9.9%YouTube.com — 8.1%Doubleclick.net — 6.4%Twitter.com — 2.3%Ad.yieldmanager.com — 1.9%Redtube.com —1.4%Limewire.com — 1.3%Pornhub.com —1.2%Playboy.com — 1.2%Facebook is also the top whitelisted item which shows you there’s a love/hate relationship going on with users. Business-based PCs in particular don’t like it and the top 3 in the list above are also the top 3 blocked when looking only at business machines.As opposed to the top 10 blocked sites, the 10 most blocked categories is as expected:Pornography – 85%Sexuality – 80.1%Tasteless – 77.3%Proxy/Anonymizer – 76.2%Adware – 69%Nudity – 67.2%Hate/Discrimination – 58.7%Lingerie/Bikini – 58.5%Gambling – 58%Drugs – 57.3%Other interesting facts OpenDNS’s review of 2010 turned up include 45% of all phishing attempts being targeted at PayPal, and the top 5 most-phished brands were:FacebookWorld of WarcraftSulake Corporation (Habbo)SteamTibia (online games)While OpenDNS can only base its results on the traffic it handles, that’s a significant amount of traffic. It’s the largest global DNS service and resolves 30 billion DNS queries a day and services 15 million requesting IPs every day too. Even so, that’s only 1% of the Internet’s population worldwide.Read more at the OpenDNS press release, via CrenkMatthew’s OpinionAlthough I didn’t expect Facebook to be top, it’s bound to be getting blocked a lot. The social network is a time sap and businesses hate it. You can spend all day on there and it feels like the blink of an eye. The same is true of YouTube which will happily entertain you all day, especially now that user video uploads can be up to 30 minutes long, and feature films are becoming more common.I expect more blocking to occur in future, especially at companies that have Net access for all their employees. These sites are only getting more popular and any time spent online eventually sees an interaction with them. That’s especially true of Facebook which seems to be pushing into new markets whenever it sees an opportunity.