This is an old article, but I am curious about how tumblr will generate revenue.
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150M active users http://expandedramblings.com/index.php/resource-how-many-people-use-the-top-social-media/
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Istanbul
150M active users
http://expandedramblings.com/index.php/resource-how-many-people-use-the-top-social-media/
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