>> "...no reason or benefit..." I donno, seems legit to me. Adding "nofollow" just means "I'm not accountable for this" -- it's overloaded to mean both "My sit

>> "...no reason or benefit..." I donno, seems legit to me. Adding "nofollow" just means "I'm not accountable for this" -- it's overloaded to mean both "My site is linking here but I didn't vet it first" (the UGC version), versus "This isn't actually me, it's an advertiser borrowing space on my site" (the sponsored version). Your site/forum might want "credit" for being a sort of attention aggregation hub without necessarily taking responsibility for all the content your users post -- you may want a softer middle ground if such a thing becomes available. But in the advertiser version you're just renting out page real estate; your relationship with those links ends the moment the ad is displayed. Giving you a way to differentiate between the two could let you benefit from ranking and placement that more appropriately takes your user content into consideration while better filtering out noise from ad content.