renegotiating nafta was a core item during his campaign. they aim it rewrite nafta by the end of the year. that's a blinding pace for trade negotiations. uber has a new ceo. expedia head. uber hasn't ahad a ceo since june. that's when the founder resigned after investigation into the company's culture. he has not among those rumored to be in the running. that was hp head, imelt pulled out sunday because of problems with uber's board. watch that space there. >> should be a lot of pr problems there. social media certainly a huge part of the response to this tropical storm. especially from people who have been tweeting out their need for emergency help. brian stelter has more on how we will us a view this storm through the lens of social media.