Hi, I am trying to use Facebook audience insights, but once I open the audience insights page, and select age range and interests, on the right panel, the page likes, demographics etc will show the progress bar and it keeps showing the progress bar forever. I am not sure why it did not show the result after I change some parameters on the left panel(age,interests,etc). Another related question, What is the ideal audience size for a Facebook ads? Is it good to target a broad audience such as 15 million people? What is the impact on the bidding price if I choose a broad audience? Thanks!