For how much traffic it gets, myspace has to be the most poorly designed web architecture in web history. I'm sure there are many that have been worse, but they didn't have nearly the amount of traffic that myspace does. For one of the top 5 sites to routinely go down every evening and generate random errors at any time of the day, it really must have been designed by Tom. Half of their pages are coldfusion running through a coldfusion emulator on dotnet, and the other half are bastardized ASP.net webforms. They have tons of static variables on their HTML forms. They pass so much crap in the cookies that it's ridiculous. I've seen pages where they rely on javascript/meta redirects. Everytime i log in now, an empty ad page pops up for about 1 second and then redirects toward the homepage. Half the time, they write urls to 'profileedit.myspace.com' and the other half they use 'editprofile.myspace.com'. While i'd like to think that's lazy programming, it's probably some sort of retarded load balancing solution. Sometime while they were growing, they should have renamed the CSS elements to something that was standard, so people doing layouts could avoid the shittiest reading CSS on the planet. But no, they waited until they're so huge now that it will never get worked out.
On the bright side, since the developers are so incompetent, trying to block spammers for them is like finding a needle in a haystack. They're idiots. I can't believe some of the crap you can get away with on there.