The Movie Database (TMDb) The best alternative to IMDb
The Movie Database (TMDb) is a community built movie and TV database, with every piece of data having been added by its community dating back to 2008.
Not only can you rate movies, write reviews, make lists, favourite your films but discuss them too, each movie has its own forum, just like IMDb.
www.themoviedb.org
https://www.themoviedb.org/discuss
You can also easily import your movie ratings from IMDb to TMDb!