Currently the normal way to chat with someone using the chat messenger is to add a person to my contact first and then click on the name on my list to start the chat.

 

So i would like to check how can i start a messenger conversation without the need to add the person as a contact first?

 

Example:

A webpage will list all the person online, apon clicking the a person name (a hyperlink), it would start a messenger chat window and could immediately start the converstion, even when both of them are neither in each other's contact list.

 

Possible?