In plain English
Comments, forum posts, reviews and profile fields are all user-generated. Anything a visitor can put a link into falls into this category.
The attribute tells search engines that you did not choose this link, which matters because you are responsible for what appears on your pages either way.
What to know
Why it matters
Sites with open comments accumulate outbound links nobody vetted. The attribute limits what those links imply about your judgement, and prevents a comment section from becoming a liability.
Common mistakes
FAQs
Do I need this if comments are closed?
No, but check user profiles and review fields, which are also user-generated.
Is ugc better than nofollow for comments?
It is more specific and therefore preferable. Both are acceptable.
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