At Facebook's f8 developer conference, the company announced some initiatives to improve the quality of applications on its site, but it may have disappointed developers by making no significant new additions to the platform.

Founder and CEO Mark Zuckerberg kicked off Wednesday's event by acknowledging that Facebook has made mistakes in the year since it threw its site wide-open to third-party developers.

"We haven't done enough to reward the good applications or punish the applications that have just been abusive," he told a crowded hall of developers in San Francisco's South of Market district. "We're going to have to find a way to ensure the applications that provide the most long-term value are the ones that are succeeding."

Facebook has struggled to control applications that use annoying or deceitful means to attract more users, like spamming people with unnecessary notifications or sharing information from people who have not given their permission to do so.

To overcome these problems, the company on Wednesday introduced the Facebook Verification program. Starting in September, developers are invited to submit their applications to Facebook to see if they meet certain criteria for trustworthiness. Applications that have been verified will be marked as such so that users know they can trust them.

It also introduced the Great Applications program for applications that meet an even longer list of criteria, including being "meaningful" and well-designed. The music streaming service iLike and a philanthropy application called Causes were the first to be recognized as Great Applications. The company expects to select only a dozen or so Great Apps over the next year, officials here said.

Zuckerberg also announced some new tools for developers, including the ability to submit their applications to Facebook's language-translation system, which enlists Facebook users around the world to help translate the site. Facebook has used the system to translate its own Web pages into several languages, and it is now available to third-party applications to use.

Aside from some other minor announcements, including details of when Facebook Connect will be rolled out, the company offered little in the way of major developments. It did not announce a system that would allow applications to accept payments, for example, which had been widely rumored, and it didn't announce plans to make Facebook applications available on mobile devices.

Ray Valdes, a research director with Gartner, characterized Zuckerberg's tone as "contrite" and said the company has focused on fixing what is not working well on Facebook rather than rushing ahead with new capabilities.