Will I be penalized by Facebook for using a third party social platform to post?
Regarding the third party usage on Facebook, no research has found Facebook penalizing people for using third party tools. Facebook recently did away with their "Edgerank" algorithm and replaced it with a more robust calculation (you can read about it here) whereby they track who you usually engage with and push those people's posts to the top. As long as your fans are engaging with your content, there should be no reason your posts won't continue to be displayed in their News Feeds. Facebook also doesn't have attributions on posts sent by third party applications anymore, so it is much more difficult for people to know if brands are using third party tools.