Syndrome Players Waiting Players
In my experience as a player, I often feel that I'm posting much more often than other players. So, if I feel that I'm reaching a 2 posts per everybody else's one post rate, I tend to back off a bit and wait for everybody else to say something.
There are also times when a person makes a post either asking a question of another player or indicating he/she is waiting for another player to post an action before continuing that I feel sometimes gets lost and leaves a game hanging for a bit.
The only problem with that situation is that I'm not sure how to address it. If I'm the Dungeon Master, I'll give a player a day or two to respond, otherwise I'll move the game forward and see if they make up the actions in their next post.