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> 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 10,000 domains. http://someonewhocares.org/hosts/hosts /dev