TMDB is the new IMDB for msg boards
Just type in any movie in the top "magnifying glass/white bar" There is discussion boards at the bottom.
https://www.themoviedb.org/movie/792-platoon
They seem to have almost every movie IMDB did, and this site is better than "IMDB2" (another site which IMDB'ers are suggesting, but that site doesn't have exact movie searches like TMDB)