Running around on the Citadel, I have noticed minor conflicts that arise where you can side with one of 2 people. After siding with them, I have noticed in the corner of the screen "War Asset Updated!"
The question lies in that, are there any of these that have a major impact on the war assets, or are they just small boosts/decrements that you can obtain or are there even any that do decrease war assets? Also, is there a set amount of them that pop up?