Internet is a new social space. Getting in contact on Facebook, reading online newspapers, discussing about the news on forums, finding school friends, sharing pictures, shopping online , talking on messenger or on twitter, comparing prices, doing researches in an online encyclopedia, replying to a public consultation, creating a blog... all these are different activities we used to do in the "physical" world so far. And the list is getting looser day after day, it's getting more sophisticated.
This new social space is complex, constantly moving, growing.