MySpace, the Web’s largest social network, has gradually been imposing limits on the software tools that users can embed in their pages, like music and video players that also deliver advertising or enable transactions.

At stake is the ability of MySpace, which is owned by the News Corporation, to ensure that it alone can commercially capitalize on its 90 million visitors each month.

“The reason why I am so bummed out about MySpace now is because recently they have been cutting down our freedom and taking away our rights slowly,” wrote Tila Tequila, a singer who is one of MySpace’s most popular and visible users, in a blog posting over the weekend. “MySpace will now only allow you to use ‘MySpace’ things.”

Ms. Tequila, born Tila Nguyen, has attracted attention by linking to more than 1.7 million friends on her MySpace page. To promote her first album, she recently added to her MySpace page a new music player and music store, called the Hoooka, created by Indie911, a Los Angeles-based start-up company.

Yet another thing that we were predicting is coming about... 3rd party services are being squeezed out of MySpace.