Linking makes it easy to invite friends to chat!
The invite panel can popup automatically after linking established successfully.

And if you want to invite friends later, there are three ways to do it:
1. clicking the social buttons on the top
2.or the buttons above the input area
3.or the button in the settings dropdown menu

Meanwhile check the option "update status", that will spread the chat on Facebook like this.

Each link will drive several visits to your chat room, and your chat can maximize exposure by this means.