[quote=@Leotamer]
I would like to suggest that a chat server probably would help. Something that can happen to RPs is an inactivity cascade, where everyone just nervously waits for someone else to make the first post. 
[/quote]

This can just simple be solved by... posting, I guess? I mean, you are supposed to be able to not only react to things but much more importantly to be active and help advance the story. Otherwise what are you doing?

Anyway, we are used to that, which is why we'll keep poking people to post when the RPs begin to get slower than is reasonable. Otherwise if everyone is going to wait someoen else to post instead of doing something on their own, the RP is surely going to die because it's a hell of a pain to have to carry this weight while GM.

In other words, players don't need a chat to solve this kind of thing. They need to learn to be proactive. Your character doesn't exist solely to be a reply-bot to others' post. Or at least it shouldn't.