Twitter CEO visits Shah Rukh Khan's house, tweets 'knock knock'

Twitter CEO Jack Dorsey visited actor Shah Rukh Khan's house 'Mannat' in Mumbai on Wednesday and tweeted "knock knock" with a picture of his house. Prior to this, Dorsey had tweeted "u up?" to Shah Rukh Khan. To this, Khan replied, "Up and Ready...And shockingly on time...if anybody has warned u about my tardiness they r just spreading fake news."