Update: You can read a more updated version of this list here.

Iron Man director Jon Favreau recently joined Twitter, and I was going to write a blog post about his entrance, but have decided instead to post a listing of all the writers, directors and actors that I’m aware of on the 140-character micro-blogging world. I’ve tried to concentrate on working actors over celebrities (for example, I didn’t include Britney Spears). I’ve tried to put everyone in the category that they are best known for. For example, Kevin Smith is better known as a director than actor or writer and Roger Avary is better known as a writer than director (at this point).

So that the list doesn’t get too crowded, I’m only going to include actors, writers and directors that have had a major film released (there will be a few exceptions). I’m sure there might be some people I missed (especially in the screenwriter section). If you know of any credited screenwriters, directors or actors that we may have missed, please leave their Twitter names in the comments below.

Directors:

Writers and Actors after the jump.

Writers:

Actors:

And as always, you can find me at:

/Film Contributors: Dave Chen, Devindra Hardawar, Adam Quigley, Hunter Stephenson, Brendon Connelly, Kevin Kelly, Steve Mason

Updates:
3/6/09: List posted
3/6/09: Donald Glover, Roger Avary, David Hewlett, Kate Hewlett, Brea Grant, Mark Romanek, David Wain, Jon Hurwitz, Joe Lynch, David Bruckner, James Moran, Michael Stephenson, Sean Flanery
3/23/09: Aubrey Plaza, Rian Johnson, Faizon Love, David Blue, James Kyson Lee, Jonathan King, Aziz Ansari, John Cleese, Danny Masterson

sources: Cinetuyoymio, valebrity.com, ScreenRider, nitroslick, danlight, jasmined , webconnoisseur, Scott Weinberg, hollywoodchain, JoshDaws