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In early trading on Tuesday, the stock fell 3% to as low as $13.90, a level it has not reached since the company went public in November 2013. The broader stock market was also selling off.
The social network has been struggling to ramp up its number of active users.
When it reported first-quarter earnings last week, its revenues missed estimates, and guidance for the second quarter was also light.
Several Wall Street analysts that cover the stock downgraded their outlook for future earnings, as well as their expectations for how high the shares can climb.
Here's a chart showing the lifetime of Twitter shares:
