All links will be followed by Google Bot no matter what tags are assigned, the only difference is the 'nofollow' links wont pass PR value
I am not sure but I think external and nofollow tags are the same. So I am not sure if google bot follow such links. May be you will find the answer in google webmaster groups.
No follow and rel='external' are NOT the same. rel="external" is the xhtml valid code of the old (non xhtml valid) target="_blank" target="_blank" is not supported in xhtml strict It opens external links in a new window/tab but to use it requires the use of javascript as well. function externalLinks() { if (!document.getElementsByTagName) return; var anchors = document.getElementsByTagName("a"); for (var i=0; i<anchors.length; i++) { var anchor = anchors[i]; if (anchor.getAttribute("href") && anchor.getAttribute("rel") == "external") anchor.target = "_blank"; } } window.onload = externalLinks; Code (markup): You can also use CSS as well if to place a small icon next to your links marking them as external such as... a[rel="external"] { background-image: url(/pics/external.png)} Code (markup):
Hi, In Google no matter what tags are assigned, the only difference is the 'nofollow' links wont pass PR value