The Best of Sean Hannity hits for the holidays and sits down with Greta Van Susteren to discuss the importance of Social Media and her new book, "Everything You Need To Know about Social Media." Van Susteren continues with the future of her career after she has left MSNBC. Was she fired for her political beliefs? Sean thinks so... The Sean Hannity Show is live weekdays from 3 pm to 6 pm ET on iHeartRadio and Hannity.com.