I’m glad I came across this article in Search Engine Land today – I’ve seen tons of forum posts, articles, and heated debates about whether or not duplicate content will negatively affect your site or rankings.
The actual value (25 to 30 percent) seemed high to me, but is not really surprising when you take into account summaries or curation (what the next part of this article is!), product descriptions, and general distribution of information.
Here is the relevant part of the article on duplicate content:
… Read the restMatt [Cutts] said that somewhere between 25% to 30% of the content on the web is duplicative.
