I often wondered how that hacker was able to hack into so many celebrity cellphones but...

maybe they actually got the photos from a single source. The first thought I had is maybe those photos were stored on a high level director or producer's computer.

Lets just say that a hacker was able to hack into hundreds of cellphones, why would they just stop as celebrities? Why not politicians or business owners?

I think this is a lot deeper and messier than we're being told and Hollywood seems to be the target of these blackmailers.

Lets look at the timeline from Wikipedia:

March 21, 2013 - The film was announced

October 10, 2013 - Filming began

December 20, 2013 - Filming concluded

June 20, 2014 - North Korea voice their objections through Kim Myong-chol

June 25, 2014 - The Korean Central News Agency (North Korean State TV) "condemned" the movie

July 11, 2014 - North Korea files a complaint with the UN

August 7, 2014 - Sony suddenly pushes the release date from October 10, 2014, to December 25, 2014

August 31, 2014 - Hundreds of Nude photos of female celebs are leaked on the internet with the last photos released on September 26th, 2014. The hackers claimed to have other photos and videos but never release them.

November 24, 2014 - Hackers start releasing emails and other data on Sony entertainment. They claimed to have 100 terabytes total.