By 2020 , experts say virtual worlds will be widespread . Online worlds could replace Facebook as most popular Internet ##place . Experts say young people could lead spartan , offline , luxurious lives online . But Star Trek - becoming fully - interactive is still some way off .
By 2020 , experts believe virtual worlds will be widespread . Online worlds could replace Facebook as most popular Internet phenomenon . Experts say young users could lead spartan lives offline , luxurious lives online . But Star Trek-style fully-interactive holodecks still some way off .