I think I understand the purpose of adding
rel="nofollow tags to links in user posts: it’s basically telling search engines “this link is not endorsed by this website” in order to make spamming (or rather spamexing) less attractive. So it makes sense to do that on any forum.
But discourse allows me to exclude certain domains from that policy using the
exclude rel nofollow domains site setting. I can also turn it off all together by unticking the
add rel nofollow to user content setting.
But I’m wondering: why would I want to turn nofollow off at all? Is it just to help search engines distinguish between good and bad links (I guess that’s why TL3 users are exempt from nofollow by default) or is there any benefit for my forum? Which domains have you exempted (except your own)?