> It isn't "virtually impossible to block"; mapping addthis.com on the
> client computer to 127.0.0.1 (using /etc/hosts on Linux and Unix
> machines) does a nice job of it. But anyone who uses it really is
> betraying the user's trust.
I was looking around for a complete set of addthis domains to block and
came across this extensive, up-to-date hosts file. It blocks more than