Cyberslacking can be a real drag on companies.

The solution for many firms seems to be to simply block the websites on which they believe their employees will waste the most time. Studies have shown social media to be a major time sink, as well online games and personal email.

A study from DNS-resolution service OpenDNS, "2010 Report on Web Content Filtering and Phishing" details just what sites companies were most likely to block last year, be it social networking websites or sites that have a reputation for fostering procrastination.

Take a look at the slideshow below to see if your favorite sites are among the most blocked by companies. Which sites do you see that you think shouldn't have made this list?