Considering that the majority of cams do not have an element ratio anywhere near the size of the cover image, you'll have to crop your image to be the best size for a Facebook cover image.
N'ihi na ọtụtụ igwe ese foto anaghị enwe akụkụ dịka ọ bụla na-eru nso foto nke ihe mkpuchi ahụ, ịkwesịrị ịkọ ihe oyiyi gị ka ọ bụrụ nke kwesịrị ekwesị maka foto mkpuchi Facebook.