Instagram is owned by Facebook, and Instagram alone has an estimated 800 million monthly active users as of September 2017 (Statista). Since early last year, Instagram has started allowing anyone with a business account to advertise in the Stories section of Instagram. These ads are shown in the middle of users watching the people or brands they follows stories. These are short ads (no longer than 15 seconds), often include great visuals and music, and are great for introducing a new product, catching attention and staying top of mind with potential customers and your current followers.
Adstage, Prater. 2018.
The way you create ads in through your current facebook ads channel, then when choosing a placement you would select Instagram stories. The dimensions for these ads are as follows:
-video ratios 16:9 to 4:5 and 9:16
-video file size: 4GB max
-video length: 1-15 seconds
-video sound: optional
So if you want to expand your social arsenal of ads, consider Instagram stories by talking to your advertiser or trying it out for yourself!