Coolabi has hired social gaming firm Enteraction to create a Facebook application for the Purple Ronnie brand.
Launching in time for Valentine's Day, Purple Ronnie's Express Yourself will enable users to send poems, romantic messages and other branded communication such as invitations and thank yous.
Some premium clothing and avatar lines will require in-game purchase, while some items can be unlocked by having a large group of friends.
Following the launch of the application on Facebook, there is also development planned for a mobile app.
"Purple Ronnie is all about social expression and there can be no brand better suited to the world's largest social media platform," said Michael Dee, director of content at Coolabi.