Twitter recently released their QuickBar on their iPhone apps, adding ads the the top. The move proved unpopular with users, and Twitter has announced that it was only a test and that they are removing it.
Rather than continue to make changes to the QuickBar as it exists, we removed the bar from the update appearing in the App Store today. We believe there are still significant benefits to increasing awareness of what s happening outside the home timeline,” said the Twitter blog. “Evidence of the incredibly high usage metrics for the QuickBar support this. For now, we re going back to the drawing board to explore the best possible experience for in-app notification and discovery.:
Source: Twitter Blog