Hi seo friends can any one tell me wat is the different between rel="bookmark" and rel="nofollow" and rel="do follow"
rel="bookmark" Code (markup): Refers to a bookmark. A bookmark is a link to a key entry point within an extended document. The title attribute may be used, for example, to label the bookmark. Note that several bookmarks may be defined in each document. The referenced bookmark is part of the extended family of the boomkarks represented by the current document... rel="nofollow" Code (markup): Simply requests that this particular item NOT be index by web bots and is usually considered taboo in the SEO world. This can negatively impact your search enging ranking. If you wish to block a certain page then you should do so in your robots.txt file. You shouldn't really need to use rel="nofollow" if your site it setup properly. On individual links then I suppose it wouldn't hurt your ranking at all.
On top of what Atomic said, rel="dofollow" doesn't exist. Dofollow isn't even technically a proper term. Non-nofollow would be a technically correct way to put it because there is no such thing as a dofollow link. Only links with or without nofollow tags.