Earlier quoted context omitted.
Maybe for your friend group, but absolutely not mine (20-25). That market is huge for advertisers. Thar said I can't imagine their losses ever being recouped in ads.
Maybe I am mistaken, but I find it hard to believe that if people in that demo are on Facebook enough to see movie trailers there that they wouldn't then post about the movie they just saw.
I have about 1000 Facebook friends, most within that age group. About 15 people still post there at all. I know more people using Facebook for college meme groups than for social interaction.