There's a whole psychological aspect behind it that can get really long and somewhat annoying, but I can try to explain it for you if you'd like. The short version is: some people are the same, some people aren't. I'm the same, but I know that a lot of my friends aren't. I also would like to point out that some online stuff can change people. Not the fact that they are online, mind you, it's the people they associate with. Although the same can be said for the people that hang out with people in real life, so it affects people the same and whether they would act differently in one place or another is seen more in how they are influenced by others than the actual factor of the internet in and of itself.
And that was the short version. XD
And that was the short version. XD