Twitter Keeps Changing Its Definition of Success

An employee works inside the Twitter Inc. headquarters in San Francisco, California.

Photographer: David Paul Morris
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Another quarter, another new metric for Twitter Inc.

It hasn't been an easy time to explain the company's financials to investors. First-quarter results leaked early (during market hours Tuesday), forcing Twitter to publish results ahead of schedule. Revenue and growth figures missed estimates, and the stock slumped.

Over the past several quarters, executives have made changes in how Twitter's performance should be measured. The tweaks are starting to cause some concern among analysts and investors, because visibility into the future performance of a young company is critical for making investment decisions. Here's a summary of the times that Twitter has told Wall Street to think differently about its performance1430336574515: