Welcome to WebmasterWorld Guest from 18.104.22.168
No indication as to the reason, but it certainly isn't the first time this has happened.
I wonder if this is Yahoo related...
I just found a site with a PR 7, consisting of 3 pages, i checked every page for backlinks and the site only had one external backlink of PR 4.
Let's try to keep it in one thread :)
Pubcon Platinum Sponsor 2015