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OpenDNS, a provider of DNS-based security and infrastructure services, released its list of sites that were most often blocked by businesses in 2010. The most obvious reason for most of the sites on the list is to minimize distractions and keep workers productive. I even found out that my company blocks one of these sites.
No surprise here as Facebook was the most blocked site by businesses with almost one in four (23 percent) trying to put the clamps on social networking site.
The full list.
UPDATE: Here are some more lists of filters, blockers, and cybercrime from OpenDNS.
MySpace was the second most blocked site at the office by 13 percent of businesses.