I have a website that contain all user generated content. The users are free to add links to the content. I also provide my users with an about the author column, where they can add links too. All the links in my site are
dofollow, as of now.
Is this an SEO threat? There is a strong editor system and people are not allowed to spam, but there are more and more articles and about the author columns coming up with outgoing links.
Nofollowing all external links is an SEO threat, as some users say.