When using an RSS feed within Hootsuite, you can limit the amount of content being automatically pushed out to your followers by:

Setting the frequency that Hootsuite checks for new content to once a day, rather than once an hour, directly limits the amount of content automatically published. A less frequent check means fewer new posts will be detected and subsequently shared over a given period. Turning on the 'Approvals Queue' would require manual approval for each post, which controls what gets published, but doesn't inherently limit the amount of content the RSS feed itself generates or attempts to push. Specifying demographics is not a feature available for RSS feed distribution within Hootsuite. Specifying excluded topics is also not a direct feature for RSS feeds in Hootsuite; while you can filter content, it doesn't limit the overall volume of new items detected by the feed itself.