San Francisco investigates Twitter's new sign

The City of San Francisco is investigating Twitter after the social media giant put up their new logo by the bay. The "X' logo sits on top of the building formerly known as Twitter's headquarters. The city says Twitter didn't have a permit for the new sign. Earlier this week, police stopped workers trying to put it up because they didn't tape off the sidewalk below. Police were concerned something could fall and hit a pedestrian.

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