We would like to recommend you a great blog post by Jon Loomer which explains various Facebook image dimensions… for cover image, for link post, photo post, for ads, etc. After reviewing all the dimensions you will notice that it's so many different sizes that it's almost impossible to keep up with it. Well, good luck 
Facebook has announced a new Premium Video Ads for News Feed, which has been tested since December. Seems like the product has matured and the premium video ads will be available for selected advertising agencies at launch.
The ads itself will autoplay without sound, its length is 15 seconds. User can either ignore it by continuing scrolling down (the video will stop) or click the video which will open in fullscrenn mode and start from the beginning with sound.
Big news for brands and businesses. Facebook will be redesigning Facebook Pages to make it easier for people to find the information they want and help Page admins to find the tools they use most.
Current two column design where both collumns are equally wide will change a little bit. Posts will now only appear in the right (wider) column to provide better consistency. The left (narrow) column will include information about your business, like the map, your hours of business, phone number and website URL, photos and videos. As you may notice, the upper boxes with Likes, Photos, Events, Apps will disappear and will only be in form of a text in the menu.
