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    Official: ISIS pumps out 90,000 messages a day

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Official: ISIS pumps out 90,000 messages a day

Experts say the key to ISIS' success is the terror group's ability to recruit fighters from all over the world via social media. CNN's Kyung Lah has more.

Official: ISIS pumps out 90,000 messages a day

Experts say the key to ISIS' success is the terror group's ability to recruit fighters from all over the world via social media. CNN's Kyung Lah has more.