► Subscribe to the Financial Times on YouTube: http://bit.ly/FTimeSubs<br /><br />Twitter has named co-founder Jack Dorsey as chief executive - even though he already runs start-up Square. Hannah Kuchler and Leslie Hook discuss what the move means for the companies and how he plans to tackle both their challenges at once.<br /><br />For more video content from the Financial Times, visit http://www.FT.com/video<br /><br /><br />Twitter https://twitter.com/ftvideo<br />Facebook https://www.facebook.com/financialtimes
