I'm sorry but I don't really understand the utility of that service ? Is there any link to other protocols ? What are the benefits of using this server instead of something like gtalk or some other widespread service ?
Why should I jump to this service and make my friend so the switch as well ?
Thanks :)
edit: I know perfectly what is DDG and I really love this search engine, but still.. don't get me wrong, I'm just asking for answers there, not being rude