Having trouble getting your photos sized for your different platforms? There's a lot of information and I'll split the blog posts by platform. It's frustrating, but once you get the hang of it, it goes smoothly. This post, Social Media AD Sizes 1 is dedicated to Facebook.

• Cover Photo:        851 pixels wide by 315 pixels tall. Your profile photo, name, category and interaction buttons will cover areas of the photo
• Ad images:           Facebook objectives: 1,200 pixels wide - 444 pixels high for page likes, etc - 675 pixels for video - 900 pixels for Page post - 628 pixels for all other objectives
• For Carousel       3 to 5 images with clicks to website - 600 x 600 pixels

Keep in mind the Facebook chat for Ad Help is quite good and responsive.