It's been several hours, and here is a brief update on some observations that may or may not help staff to figure out what is up.
One of the tags I used was Libya. This is one of the tags where my post is not showing up. At the time I posted my post, the post at the top of that tag page said it was posted "one minute ago". Five hours later, it still says it was posted "one minute ago", and it is still at the top of the page.
Another odd thing, not sure if it is related but it could be, it that the system keeps automatically showing me as "following" that tag. I am not. The first time I noticed it, I unclicked "Following" and changed it back to normal. As soon as I leave the page, and return, it shows me as "following" again. Same if I hit refresh. Not sure if this is relevant, just an observation. But because this is one of the tags where there is a problem, and this is not supposed to happen either, I thought I should tell you about it as a possible indicator of whatever is going on.
But the fact that a post is still showing up as posted "one minute ago", that I know for certain was "one minute ago" when I posted five hours ago, probably is relevant. I think this may be occuring in the other tags that are messed up too, but can't say for certain. I don't think it is just a popular tag issue however, because as I said, at least one tag I used I know for certain is not a popular tag - nothing posted since yesterday, and it too, appears to be stuck, and my post is not there. Stuck may be the right word, if it is 'Stuck" this may explain why no posts have appeared there since yesterday. Or it may be that no one has posted anything to that tag since yesterday. Again, just an observation while trying to figure this out.
Finally, I originally said this was a problem with my "latest post", which was foolish, because by the time staff gets a chance to look at the problem, it may not be the "latest" post. So I am providing a link to the specific post, and only post, that appears to be having this problem. It is here:
Thanks again folks, thats all I know for certain.