hosts file blocking reddit, facebook, and some ads websites.

hosts

##
# Host Database
#
# localhost is used to configure the loopback interface
# when the system is booting.  Do not change this entry.
##
127.0.0.1	localhost
255.255.255.255	broadcasthost
::1             localhost 

# Block Reddit
127.0.0.1 reddit.com i.reddit.com www.reddit.com m.reddit.com

# Block Facebook IPv4
127.0.0.1   www.facebook.com
127.0.0.1   facebook.com
127.0.0.1   login.facebook.com
127.0.0.1   www.login.facebook.com
127.0.0.1   fbcdn.net
127.0.0.1   www.fbcdn.net
127.0.0.1   fbcdn.com
127.0.0.1   www.fbcdn.com
127.0.0.1   static.ak.fbcdn.net
127.0.0.1   static.ak.connect.facebook.com
127.0.0.1   connect.facebook.net
127.0.0.1   www.connect.facebook.net
127.0.0.1   apps.facebook.com

# Block Facebook IPv6
fe80::1%lo0 facebook.com
fe80::1%lo0 login.facebook.com
fe80::1%lo0 www.login.facebook.com
fe80::1%lo0 fbcdn.net
fe80::1%lo0 www.fbcdn.net
fe80::1%lo0 fbcdn.com
fe80::1%lo0 www.fbcdn.com
fe80::1%lo0 static.ak.fbcdn.net
fe80::1%lo0 static.ak.connect.facebook.com
fe80::1%lo0 connect.facebook.net
fe80::1%lo0 www.connect.facebook.net
fe80::1%lo0 apps.facebook.com

# Block Google Adservices
127.0.0.1 www.googleadservices.com adservice.google.com
127.0.0.1 adclick.g.doubleclick.net

# Block others
127.0.0.1 results.searchlinks.com api.searchlinks.com beacon.searchlinks.com js.searchlinks.com
127.0.0.1 thumbnails.cbsig.net saa.cbsi.com dw.cbsi.com
127.0.0.1 tz284.com
127.0.0.1 www.adsensecustomsearchads.com