Visual assets play a huge role in attracting and developing engagement on Facebook. However, there's more to creating compelling visuals than simply working with a graphic designer. Knowing the right dimensions for the various channels on Facebook is essential to avoid image pixelation and clumsy image text.
Though, with technology evolving so fast, it's hard to keep track of all the changes. To help you keep your images within the scope of Facebook’s sizing and dimensions, TechWyse created "The Complete Facebook Image Sizes and Dimensions Cheatsheet (2017)".