I just wrote this blog post after being redirected to porno sites while browsing Alexa top 500 global.
I checked it nice blog post but its not going to porn now just its not right now. http://http//www.google.com Its suppose to be http://www.google.com but its http://http//www.google.com
Yes I noticed it is doing that on one of my computer but on the other one it is sending me to random sites. I wonder if I have some sort of spyware that sends me to random sites instead of 404 pages......mmmmmmm
Are you sure it wasnt just spyware playing around with your computer? I suggest you download Spybot search & destroy and do a clean check then go back to Alexa and see if it still happens.
I think you have a searious MALWARE problem in your PC you might want to do a check, now as far as Alexa goes for a long time the site has had a problem where you click on a link for the top sites and it adds an aditional HTTP so if you go to MSN it will go to HTTPHTTP://WWW.MSN.COM instead of HTTP://WWW.MSN.COM. Check your PC!