Facebook (e.g., “Like us on Facebook”). % Do use the “f” Logo alone or alongside other social icons. It should be used at equal size to neighboring icons. % Do link directly to your presence on Facebook, when using the “f” Logo online, such as your website, blog or email campaigns.
https://facebookbrand.com/wp-content/uploads/2018/09/Facebook-Brand-Assets-Guide_09_05_2018-2.pdf

