
 Do the names Facebook, Twitter, hi5 etc.  ring a bell? They're all popular 'social networking' sites which help  people meet and talk about things online. Although there are lots of  differences between them, what they all have in common is that they  provide a place for people to interact.Are you a current user of one (or more)  of these sites? Do you spend a lot of your free time on them? What do  you think about communication online? What are some possible dangers it  may include?
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