You won't get banned.
But there is a pre-conception that bitly links are "spam or virus" related.
This is due to a lot of negative press, so viewers may not click them.
If I was you, I'd just link them normally. It's not as if you gain any massive benefit from bitly by using their service.
Plus if you link them normally, viewers will see EXACTLY where the link will take them (i.e. Facebook page, Twitter profile, etc.)