Top Facebook application developer Slide has rebranded FunWall, the biggest application on the Facebook Platform by monthly reach, as “Slide FunSpace (formerly FunWall).” FunWall’s 21 million monthly active users should now notice the chance on their Facebook profile pages and bookmarks.

The move marks the first time Slide has included its company brand in the name of its Facebook applications. While all Slide applications are heavily branded within the canvas page, Slide’s other popular applications – Top Friends and SuperPoke – don’t include the company’s name in the app title.

The change in branding may be partially due to some of the changes in Facebook’s upcoming profile page redesign. The new “Wall” tab on the profile page allows for more types of rich media content in the Facebook Wall (a combination of Facebook’s old wall and feed concepts), which many have argued encroaches on third party “wall” applications.

The change also reflects how easy it is for application developers to rebrand their applications inside the Facebook world. One change to your developer settings page and voila! – your application’s name is updated to millions of users throughout Facebook instantly.