As the communal bloodshed has worsened, some Iraqis have set up advice websites to help others avoid the death squads.
One tip - on the Iraq League site, one of the best known - is for people to draw up maps of their local area using Google Earth's detailed imagery of Baghdad so they can work out escape routes and routes to block.
For some time now, vigilante-style guard forces have been operating in many neighbourhoods, especially in Sunni areas targeted by Shia militias.
Many Sunnis see the Shia-dominated police forces as just as much of a threat, because of evidence of their involvement in kidnappings.
So part of the job of the local guards is keeping them out.
Quietly google will soon take over the world. I mean way to totally indispensable eh?