[rrich]

I opted out long ago with my hosts file.

[alecco]

One of the best:

http://someonewhocares.org/hosts/

I also block

  127.0.0.1 connect.facebook.net
  127.0.0.1 www.facebook.com
  127.0.0.1 facebook.com
  127.0.0.1 platform.twitter.com
  127.0.0.1 assets.pinterest.com
  127.0.0.1 www.pinterest.com
  127.0.0.1 gravatar.com

But some terrible web code breaks and have to uncomment selectively. (Looking at you, Rotten tomatoes)