The Transparency Report from Google shows that queries from Libya have dropped enormously over the last couple of days. See the chart showing a drop off from the afternoon of February 18, 2011. This is what shutting off the Internet to a country looks like.
This is classic arab dictators just shut off the internet. I think the internet is soon gonna be the same as the phone tapping days by the governments. they gonna manipulate it to their own agendas