It's not enjoyable for guys if meeting is failed, especially on public, in front of other people.
And the girls don't want to impose relations to the guy; everyone wants the communication and acquaintance to start without any efforts, freely.
Internet opens up a lot of prospects to meet our needs in a friendly conversation, flirting, desire to talk.
Sites like chatroulette make acquaintance with the people especially accessible and easy.
In addition to other problems of communicating with people you don’t know, it is difficult to guess whether a person is willing to chat with you.