题目内容

It is estimated that around 2.8 billion people use _________ regularly.

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_________, a Chinese site, is in second place, with about 600 million users.

Research also suggests that women are _________ on social media than men are in the U.S.

The most common social media activities are ________ other users' profile pages, reading their news, ...

Every second, _______ new Facebook profiles are created.