Follow/Nofollow attribute

Every link is determined to be either a follow link or a nofollow link. This designation indicates whether the link should pass along value to the destination page. Common uses for nofollow links are those included in blog comments. Spammers often try to leverage the strong PageRank of a popular blog by linking to their own websites in blog comments. Nofollow attributes prevent this from causing a positive effect on the spammer’s website.

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