To what extent are ‘dangerous materials’ prominent on the Internet? What do their existence mean in terms of the ‘freedoms’ the Net allows?

I've always argued that the internet is one of the best things to develop within the realms of new technology, stating the endless learning possibilities and availability of the big open world it invites to explore!
HOWEVER there is a dark side to the internet in which unfortunately alot of people have chosen get into. You often see adverts for internet providers on TV such as BT and Virgin Media, and one of the biggest advantages they now push, is security and parental control over what their children can view on the internet. I think this is hugely important because the amount of freedom on the internet makes it so easy to view pornography or the likes of rude or crude videos (such as what you might find on youtube). As lister states 'the internet is often seen by the consumers as a potentially open channel for frightening materials to enter the home' pg181.

Other dangers of the internet is ability for Hackers to view personal files, information, emails. If computer smart enough people can work their way into your computer system and send viruses through your system which result in a lot of money spent either fixing ur computer or having to buy a completely new one!