Slashus - 6:00 pm on Oct 5, 2012 (gmt 0)
I had 50 or so relatively new websites to care for that were in Bing's indexed and getting traffic (all on the same host and IP). I decided to verify them all in bwt and submit the sitemaps for each one. A day or two later, all the Bing/Yahoo traffic just kind of died.
Coincidence or does Bing not like adding sites enmasse?