I sympathise but don't you see/hear stuff she shouldn't be exposed to just by wandering the streets these days? As a 36 year old misanthropist/reasonably experienced man of the world I know I see and hear stuff I much rather wouldn't just wandering my local town of an evening.
In an ideal world and all that...
In your shoes, I'd probably try to keep my daughter off the web or lock it down to the Cbeebies site. Steps like the one being taken in Oz disturb me and I feel sure it's going to begin happening more and more.