Filter sites or apps

How to filter sites or apps on desktops (Linux) and mobile phones (Android)?

More specifically, how to block on my own laptop + mobile phone:

• YouTube
• Facebook.

Desktop: Update /etc/hosts

Quite simple: Add this to /etc/hosts:

# Block some sites
########################################
#
0.0.0.0 	youtube.com
0.0.0.0 	www.youtube.com
0.0.0.0 	facebook.com
0.0.0.0 	www.facebook.com
0.0.0.0 	tweakers.net
0.0.0.0 	www.tweakers.net

::0 	youtube.com
::0 	www.youtube.com
::0 	facebook.com
::0 	www.facebook.com
::0 	tweakers.net
::0 	www.tweakers.net

• Create an account with root privileges for someboy else (my girlfriend)
• Remove my own root privileges.

See also

• Webfiltersoftware

Sources

• https://duckduckgo.com/?q=linux+hosts+block+url