When online, people tend to hide their true self, or show only what they'd want the other person to see, or show them what they think is appealing to the other person. An example, is that if someone liked a specific topic about something, the other person would act interested and talk only about that topic, to bring attention to themselves and have something to talk about. This can be bad, especially if they are lying and saying that they are into something, when they aren't, because now, they are lieing to themself, and the other person, and thus would lose a friendship. Some people do this to deceive while others may do this because they can't socialize propelry, which isn't necessarily a bad thing, but then they aren't putting themselves out there and actually being themselves. They will never learn to make real friends this way.