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Pictures | Thu Nov 7, 2013 | 8:55am EST

Inside Twitter

<p>A pillow is placed on a couch at Twitter headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith</p>

A pillow is placed on a couch at Twitter headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

A pillow is placed on a couch at Twitter headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>Twitter employee Amber Costa works on a computer at Twitter headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith</p>

Twitter employee Amber Costa works on a computer at Twitter headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

Twitter employee Amber Costa works on a computer at Twitter headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>Small wooden bird feeders are displayed at Twitter's headquarters in San Francisco, California October 4, 2013.  REUTERS/Robert Galbraith</p>

Small wooden bird feeders are displayed at Twitter's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

Small wooden bird feeders are displayed at Twitter's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>A view of the game room at Twitter's headquarters in San Francisco, California October 4, 2013.  REUTERS/Robert Galbraith</p>

A view of the game room at Twitter's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

A view of the game room at Twitter's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>A Twitter employee works at a computer at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith</p>

A Twitter employee works at a computer at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

A Twitter employee works at a computer at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>A worker tends to the lawn on the roof of Twitter headquarters in San Francisco, California October 4, 2013.  REUTERS/Robert Galbraith</p>

A worker tends to the lawn on the roof of Twitter headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

A worker tends to the lawn on the roof of Twitter headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>Twitter employees work at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith</p>

Twitter employees work at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

Twitter employees work at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>Twitter employees gather at a table at the company's headquarters in San Francisco, California October 4, 2013.  REUTERS/Robert Galbraith</p>

Twitter employees gather at a table at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

Twitter employees gather at a table at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>A television crew looks on outside Twitter's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith</p>

A television crew looks on outside Twitter's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

A television crew looks on outside Twitter's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>Twitter employees relax at a rooftop spot at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith</p>

Twitter employees relax at a rooftop spot at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

Twitter employees relax at a rooftop spot at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>A Twitter logo is shown on a laptop computer at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith</p>

A Twitter logo is shown on a laptop computer at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

A Twitter logo is shown on a laptop computer at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>Employees talk in the dining area at Twitter's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith</p>

Employees talk in the dining area at Twitter's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

Employees talk in the dining area at Twitter's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>Twitter employees sit in a cafeteria at the company's headquarters in San Francisco, California October 4, 2013.  REUTERS/Robert Galbraith</p>

Twitter employees sit in a cafeteria at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

Twitter employees sit in a cafeteria at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>Employees dine on the roof of Twitter headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith</p>

Employees dine on the roof of Twitter headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

Employees dine on the roof of Twitter headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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<p>The Twitter logo is seen at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith</p>

The Twitter logo is seen at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

The Twitter logo is seen at the company's headquarters in San Francisco, California October 4, 2013. REUTERS/Robert Galbraith

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