AskScience mod here. We bin all posts then manually review and let them out (hence our massive mod team). Sometimes, we don't have enough people online and posts get left in the spam filter for too long and it drops off the radar. Additionally, we try and explain why we keep certain posts in the filter (see our guidelines for types of questions to avoid), however sometimes a question is simply unsuitable and mods don't always have time to provide a customised message to explain why.

Here's the best practice. If your post have no appeared in ~3 hours. Please send us a modmail with a link to the post in question. We try our best to respond to modmails and provide suggestions to modify your question if your post was not approved. If your post was then approve, it will appear on top of the new queue.

Thanks.