I am happy to be GM at an information. I would have done this anyways, but basically if someone has a question I am happy to answer and when I see an opportunity (for characters to interact or for a good scene with plot) I usually share it on the thread. Outside of that (Thinking of large term plots and control characters who are inactive) I am not sure I would be comfortable with. While I do have a lot of experience being a GM I tend to dislike becoming Co-GM's specifically because I know I will have a different desire and direction than the original GM has and it is their creation. I am just happy enough to enjoy the ride and bank for the turns. 

As for my post in the IC. I took a small liberty in writing it up. While my character wouldn't be the first contacted location scouting and getting all the paperwork done is often months ahead of any real public announcement of a film. The cast and everyone within the project will usually know, but will be under contract to keep silent. I also wanted to take a chance to write for my character and see how he feels with the written word. if need be I can take the post down and wait for it. I wrote it with the intention to be a fun little flavor for the role play and introducing the movie project. 

In many ways it was just me practicing with the character.