If you are finding that your content has been removed, it may be a good idea to re-read the site's Community Guidelines. For specific information on why content has been removed, you can also check out the Ask.com Help Center for additional assistance.
It also helps if you point out what you said and why it shouldn't have been taken down, or why it's valid, and follows the rules. because sometimes the moderators mis-read something and take it down by accident. Thus when you point out what they took down, if it really was valid and followed the rules, they'll apologize and put it back up.