orbjuice

They have blocked the search for private keys (id_rsa) but they still need to block the search for public keys (id_rsa.pub); they're usually stored together anyway. I just did this search.

You can select to use the hpHosts’s Ad and tracking servers list, which blocks loading assets from the IPs in this list:

http://hosts-file.net/ad_servers.txt

This is essentially the same as what Ghostery does, without the option to send that information back to Ghostery.