It was 'quite the first day,' Instagram CEO says
                                
                                
                                    (Newser) -
                                    Threads, the new social media app from Instagram,  went live Wednesday , 15 hours earlier than scheduled, and execs say the response was massive, with 10 million people signing up in the first seven hours. In a  video  posted on the platform, a clearly exhausted Adam Mosseri, chief executive of Instagram,...