Dynamic ads and group purchases on a movie theatre screen

A method comprising:

• an online auction by a theatre of an ad time slot;
• a theatre giving information to advertisers about one or more of (a) a location of the screen, (b) a name of a movie to be shown, (c) day and time of a session, (d) trailers to be shown before the movie, (e) recent attendance in a/the room, (f) start and end times of an ad time slot, (f) recent purchase history by audiences in the room or in other rooms of the theatre;
• an advertiser successful in the auction furnishing an ad;
• a showing of the ad by the theatre.

A method comprising:

• a theatre receiving one or more of (a) an ad from an advertiser, (b) an URL referring to the advertiser, (c) parameters indicating where in the ad a barcode encoding the URL is to be inserted;
• the theatre adding an identifier of a screen or a location of the screen, in the URL;
• the theatre making a barcode from the URL;
• the theatre inserting the barcode in the ad;
• the theatre showing the ad on the screen;
• a patron scanning the barcode with a device;
• the device decoding the barcode;
• the device opening a browser and loading the URL.