2017 FB Ads Specs
... so of course, FB has new ad specs!
https://blog.bufferapp.com/facebook-ad-specs
goes over it in detail, including:
2 Facebook Ad Objectives, Types, and Placements
2.1 Objectives
2.2 Ad Types
2.3 Ad Placements
3 Create the perfect Facebook Ad: Design specs for the 5 ad types
4 1. Single image ad specs
4.1 Image specs
4.2 Copy
4.3 Edge cases
5 2. Single video ad specs
5.1 Video specs
5.2 Copy
6.3. Carousel ad specs
6.1 Image specs
6.2 Copy
6.3 Video specs
7 4. Slideshow ad specs
7.1 Slideshow specs
7.2 Copy
8 5. Canvas ad specs
8.1 The Canvas ad components
8.2 Ad unit (what people will see in the mobile News Feed)
8.3 Photos
8.4 Tilt-to-pan images
8.5 Video
8.6 Carousel
8.7 Text block
8.8 Buttons
8.9 Header
Good stuff indeed....
Enjoy!