Over this past weekend, Twitter added the Quick Bar, a toolbar which appears on Twitter s iPhone app, displaying trends and ads. This was one of the more outright advertising attempts ever launched by the company.
Many of the most influential and vocal members of Twitter quickly decried this addition, causing Twitter to revise it so that the ads display on the top of the app, though will not eliminate them completely. Previous attempts to help monetize Twitter include Promoted Tweets and Trends, which were designed to be unobtrusive ways to advertise while blending with the user-driven activity on the site.
Source: AdWeek