I agree with most of the points you made, however, as ccarpenterg just said, it's a sharedtalk for beautiful people, people who are introverted or not confident about their physical appearances might not be willing to video chat with strangers. In the first case you mentioned, were user willing to exchange skype names before or after they had the text chat? The reason I am asking is because text chat might make a very big difference in building the initial trust between users.