This may be old news to some of you, but I thought it might be helpful for others.

This may be old news to some of you, but I thought it might be helpful for others.  It's a link to suggested Images Sizes for various Social Media pages ---  http://www.makeuseof.com/tag/social-media-cheat-sheet-all-the-key-image-sizes-to-know/
http://www.makeuseof.com/tag/social-media-cheat-sheet-all-the-key-image-sizes-to-know