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Twitter Costs Before IPO Surge With Go-It-Alone Apps

Twitter Inc.’s operating costs are growing faster than its revenue. To understand why, consider how the microblogging service deals with would-be partners.

More than four years after Twitter touted the importance of opening its doors for programmers to build businesses to complement its short-messaging site, startups are finding themselves shut out. The San Francisco-based company has restricted outside applications in its drive to shore up control of advertising sales on the site.