You should at least do your homework before posting BS.
http://www.microsoft.com/silverlight/get-started/install/privacy.aspx?v=3.0.40624
Other than that, I may only add that HTML5 is gonna be more than enough against proprietary crap like Flash and Silverlight.
http://tech.yahoo.com/news/infoworld/20090616/tc_infoworld/79291
If you are afraid, you should not use Internet at all. The privacy statements in the SilverLight EULA is just standard across the board. Just like you search with Google, Google will keep far more information, including your search habit, your location so that it can push local Ads to you.