Twitter Eyes 500 Million Unregistered Users to Keep Up With Facebook

It's no secret that Twitter is experiencing growing pains. Last quarter, the messaging service added only 4 million new users, giving it 288 million monthly active users—versus Facebook's 1.4 billion and Instagram's 300 million-plus. Twitter CEO Dick Costolo argues that Twitter is actually much larger than the figures suggest, with an additional half-billion nonregistered consumers using the service every month. Costolo's mandate is to get those users to sign up or else serve them targeted ads.

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