Jaaser particularity is that you can found lot of correspondents, by chance, like in real life !
You exchange with your correspondents via an internal messenger system. If you are connected at the same time as other correspondents, you have the possibility of discussing live in the instant messaging for exchanges more dynamicly and nicer.
To correspond, exchange, be made friends, without never needing to give your e-mail for more security.
it is a community of nice and mind opened correspondents on the others.