On a website I work on, we create 100's of new pages a day. These urls are unique and have a life span of a few hours. There’s very little content and it's gone 24 hours later. Pages become custom 404 error pages.
Although they get a bit of traffic on long tail phrases, it's quite insignificant and that's unlikely to change.
I'm considering placing a no follow tag on the links to these pages. I believe the other pages on the site will get a bump up. On one particular category page we’ve got 300 unique links; 200 of which will be gone tomorrow and the other 100 will have a longer life span.
Would you "PR Sculpt" on this site? Unfortunately I can't change the site architecture.
Any comments would be appreciated.