All externals links on wikipedia use the no-follow tag to prevent that type of spamming (http://www.searchenginejournal.com/all-wikipedia-links-are-now-nofollow

All externals links on wikipedia use the no-follow tag to prevent that type of spamming (http://www.searchenginejournal.com/all-wikipedia-links-are-now-nofollow/4288/ http://www.searchenginejournal.com/all-wikipedia-links-are-n...)