It seem to be a problem on vbulletin forums. I tested it on another forum with same result except the image button worked...link and mail button made safari chrash. I will report this to admin on the other site and I have crash reports turned on so it will be reported to apple as well. So hopefully we get a fix soon...
I use a [old] Home Screen button to access MacRumors which brings up the site and then forwards me to Youtube app for an ad. I deleted the Home Screen button and made a new one. Opens in Safari just fine now.