We recommend the following sizes for images to have your image-type messages look their best when posted to the various social platforms.
Facebook images look best when they are either 720px, 960px or 2048px wide.
Instagram images look best when they are at least 1080px wide with an aspect ratio between 1.91:1 and 4:5.
LinkedIn images look best when they are 1200px x 627px with an aspect ratio of 1.91:1.
Twitter images look best when they are at least 600px ×335px.