Unfortunately postId goes the wrong way. It is used for paging backwards, so if you give it a postId it will return the results earlier than that postId. We'd have to change the api to add an option to make it show you everything _after_ that postId.
Sorry, I wasn't very clear w/ my question. Let me try again.
My campaign has feeds that have different polling intervals. Posts from each feed would get added to the campaign at different times, but the postId would always be increasing. If the countsince API returned 10 for a given postId, I would need to hunt around to find those 10 posts since they aren't guaranteed to be at the top of the campaign results feed. What I was asking was if I could start at the top and work my way back using the postId until I found the 10 new posts? If I compared each post's postId to my saved postId all "new" articles should have a larger postId.
As I mentioned, my testing seems to indicate that the postId is always increasing. Can I rely on this to always be true?
thanks,
Brett Bandy