Fame bar.
Fame on MSP is what helps your moviestar to level up. By leveling up, you can access more chatrooms and have the ability to have more friends.
How To Level Up
Leveling up on MSP is actually quite simple. All you have to do is either: Have people watch your movies, complete tasks, earn loves on looks and artbooks, giving/receiving greetings and the most common way is to get an autograph from a different user.