WSF Endorses these sites
Quora.com – Quora is an excellent resource for screenwriters. Many working screenwriters are available to answer many questions that screenwriters have regarding the art, craft, and business of screenwriting.
There is a plethora of great questions and great answers from many different screenwriters, producers, directors, actors, etc. You too can also go to the site and post any questions and expect detailed answers from professionals.
Quora can also be used as a research tool for screenplays as well. Whether the topic be law enforcement, military, history, science, math, cultures, etc. You can search their questions and answers or post your own.
On top of that, it’s a fun. It is perhaps one of the best movie trivia sites online, as well as a great community of film lovers discussing various topics of cinema.
Scr(i)pt Magazine’s Open Door
Final Draft’s Big Break Contest