Question said:
True, but i dislike making posts that dont really contribute to the situation at hand.
Well, many players and GMs like to have a player consensus (or at least to hear everyone's opinion) before a story can continue. Even if you have nothing to say, you have to post so that we know it. And a colorful post about doing nothing is more interesting (and more fun to read) than anything else.
If it helps, you're contributing to the situation by allowing the storyline to progress. If you haven't posted anything at all, it's either because you haven't had time to read and post or it's because you have nothing to say. The GM and players can't guess which of the two options it is.
Doing-nothing posts are also a way to communicate to the GM on how you think the game is going. If
all you do is combat and you're not interested in the talking situations, then you can post a:
"Grok scans the crowd, not paying much attention to the conversation. He is unsettled and wants to continue on."
Or, if you think the talking is interesting and/or useful but still have nothing to say you can post a:
"Grok follows the conversation intently, considering how the situation may have arrived in the first place."
In either situation, you have nothing to add to the conversation, but you're telling the GM how interested in this sort of situation you are. And the GM can try to might slight adjustments to the pace as necessary.
The examples are pretty short, and I'd like to also point you that this sort of post doesn't have to be long--I don't see the point of a long post where nothing happens--but it's still important, even if it isn't useful for the story.
There are lots of things you can do with a do-nothing post. And, sure, sometimes none of these apply. But you're still helping the storyline progress by posting.
DISCLAIMER: Though, this is all my opinion gathered through a lot of observation. I try to look at a game from a GM's point of view, when I can, in order to try to make the game run more smoothly. GMs rarely need my help, but I do feel it's prudent to contribute to a game in any way you can--story-wise, mechanic-wise, and pace-wise. And I'm sure you'd agree pace is very important in a PbP game. I'm just trying to give you ideas on what/how to post in a PbP game when you have nothing to say in order to help the pace of the game.