This helpful graphic from TechWyse shares the many different types of Facebook ad sizes and types, broken down by ads the larger ones that appear in users' news feeds and the smaller ones that appear in the ad column.
Since this social network is based on sharing content, placing a Facebook ad on a network with over a billion users is an effective way to get your product or service out there.
However, as TechWyse points out, "every time Facebook updates its User Interface, new ad dimensions are also implemented." This graphic helps to clear up some of the confusion and serves as a comprehensive guide on image sizes, word count and image ratios. TechWyse has illustrated each type of Facebook ad beautifully and to make ad creation for Facebook even easier, it has a 'Facebook Image Validator Tool' that will tell you whether or not your ad meets Facebook's requirements.