Post Removals

Hi. This is a question for the moderators, and I hope to get some clarification on what counts as a worthy post for this forum, and I think that this would be useful for others to know as well, so I hope you will post it. For the past few months I have been reading the UAE community blog through Google Reader, which means that for the first time, I can see posts that have gone up for a short time and then been removed. Usually, I understand why. It is an obvious spam post, or directly offensive to a group of people, etc. But sometimes there are legitimate interesting posts and I click on the header and they no longer exist. I am assuming that this is because they were removed. This morning, I saw a post that looked perfectly relevant and interesting. Someone had posted a link to several articles on the UAE by South Asians on a South Asian website. But, this post is no longer in existence. I'm wondering why. Can you tell me, please?