Recently a number of posts have been flagged by the spam filter that should not have. This means that when you make a post, there is a small chance that it may be stuck in an unpublished state. This is an issue that will hopefully be fixed in the near future. For the time being, the only solution to this is manual moderation. I will be checking the forums once a day to deal with spam and correct any false-positive posts that may have occurred.
Please allow for ~24 hours for your post to appear if it does not so immediately. If your post does not appear after that time please email community@alfresco.com and briefly explain the situation.
Sorry about the large amount of spam that is coming in at this time. I'm unsure as to what is causing this issue, but I will be following up with IT to find a solution. In the meantime I will be checking the forums more frequently to try and curb the amount of spam that will be visible to users.