What matters
Facebook Ad — Story dimensions at a glance
Facebook story ads take over the full screen at 1080×1920. They appear between organic stories and need to feel native to the format to avoid instant skips.
Story placements offer immersive full-screen attention but users swipe quickly. Correct sizing and native feel are essential for the 2-3 seconds you have.
Non-vertical creative gets letterboxed or zoomed, immediately looking like an ad and triggering quick swipes past.