“Share Or Die” (*1/2 out of four) was a crummy horror melodrama made from the “anyone can make a horror movie school of filmmaking”: a mysterious post begins circulating online on social media and anyone who doesn’t share it dies while a group of curious teenagers (Noah Diggs, Logan Van Dyke, Danielle J. Bowman) try to figure it out and stay alive. Promising idea for a chilling horror story and an ironic commentary on today’s social-media culture is crippled by weak script and acting. You can only think what the Wes Craven of “Scream” would have done with this material. Don’t bother “sharing” this time-waster.