The serial internet entrepreneur, who co-founded Twitter and created Medium, was turning 50 and feeling detached from friends. Maybe a new start-up could fix that. Mobile Applications, Social Media, Computers and the Internet, Entrepreneurship, Start-ups, Loneliness, Blogs and Blogging (Internet), Venture Capital, Medium.com, X (Formerly Twitter), Williams, Evan C The serial internet entrepreneur, who co-founded Twitter and created Medium, was turning 50 and feeling detached from friends. Maybe a new start-up could fix that. NYT > Business