The thing that scare me about MS buying Yahoo! is flickr...
I just had an issue with Flickr recently.
It ended up being a problem with the Betterflickr greasemonkey script I had installed.
Contacted flickr tech support and they were fast, and pointed to the problem immediately.
I admit I would probably not have thought about GreaseMonkey, because I really didn't remember what scripts I had installed.
So I removed most of the scripts that offers "better"ness.