(Reuters) - Twitter Inc said on Thursday its microblogging platform was back up partially after suffering a worldwide outage for more than an hour."We were down ... and now slowly coming back up. Sorry!," Chief Executive Officer Jack Dorsey said in a tweet https://twitter.com/jack/status/1149412372651499520.The interruption was due to an internal system change, the company said, adding that it was working to fully fix the problem.Outage tracking website Downdetector.com earlier showed that..