Using XMPP server Ejabberd, similar to what we used - you can be sure that your correspondence and personal data are protected as much as possible from unauthorized access. On your server, we do not keep any correspondence logs, do not store passwords in the public domain, as well as use the TSL encryption for both client-server and server to server. The server is temporarily kept only messages sent to a user while it is online, but they are automatically deleted as soon as they are received by the addressee.

The same say about IP-addresses and logs chat rooms - we do not write and does not store this information on our server.