SEOPTI - 4:48 pm on May 14, 2012 (gmt 0)
I'm seeing a huge drop in indexed URLs in Bing WMT. This started on May, 5th. From 500k URLs -> 350k URLs, this is huge.
Either it's a bug or something changed on this day. This chart has been consistent for at least six months.
It affects all domains with millions of long tail local URLs. It doesn't matter what link profile or user engagement they have, they are all affected exactly in the same way.
Probably their is a connection to this thread: