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Yes, but there are ways to stop people from changing it as well. Problem is then you could just use VPN to bypass it anyway.
OpenDNS is much much better and it's free too.
Has the unfortunate side-effect of negatively impacting other Google services like Google Docs and Google Calendar
This bit is a bit unfortunate for me:
Is this because it forces Google to safe-search? How does it influence these Google services?
Otherwise, great service (and great price).