Welcome to Fluther. This is a private site, and the owners have established their own rules about what type of questions are acceptable. The moderators use the guidelines to determine whether to send a question back to the asker for revision.
If your question disappeared, you should have a message to that effect with some information on what you need to do to get it accepted.
The vast majority of the users support the moderation, which is not intrusive and is performed in an even-handed manner.