I used Hootsuite before they changed the posting limits and the number of groups and pages you could post to. I also made a few affiliate sales by promoting Hootsuite. There are some other services and software you can use to make multiple posts to FB. Have you looked at Ninja Blaster? They might have what you're looking for. Plus there is a lot of features included that seem quite powerful and useful, like leaving no "footprint." By the way, I haven't used Ninja Blaster, so I don't know from the inside what it's like to use. But I am definitely going to give it a try.