I don't know what you mean with opening problems, but I don't have any problems with cnn.com, couldn't try facebook, cause it's reg site, I'm using safari 2.0.2 here. You might want to try changing your user-agent from debug menu in safari.
Can you tell us what you mean by it won't open the site? Does it redirect you to somewhere else, does it spin and never load the site? Does it time out? What's happening? Also, what OS are you running?
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thanks
http://www.firefox.com