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Our work forward is to make Twitter easy to understand by anyone in the world, and give more utility to the people who love to use it daily!

— Jack (@jack) October 5, 2015

Stepping in full-time, Dorsey will be under immense pressure from investors to rise to that challenge. With more than 300 million monthly active users, Twitter has tremendous reach but has lagged in attracting and retaining new users, who in turn entice businesses to advertise on Twitter and drive revenue.

\"The opportunity is absolutely massive. The intention is to certainly bring it to everyone around the world,\" Dorsey said this summer. \"If we build a product people love and value, advertisers and users will follow.\"

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