Wikipedia uses nofollow

All outgoing links in the Wikipedia online encyclopedia are now accompanied by the nofollow attribute, blogger Kersten Kambrovski writes .

Thus, these links are not counted in search engines and are not suitable for SEO. The blogger believes that such a measure will not save Wikipedia from spam, but will reduce its amount.

Kersten Kambrovsky also cites references to discussions where the pros and cons of introducing this measure are discussed.