Common image sizes for social mediaAugust 13, 2013
I found this in a quilting magazine and figured it was useful to share — it lists the common images sizes for profiles, avatars, and banners for each of the main social media and sharing platforms.
(From Quilting Arts Magazine, April/May 2013, Issue 62, page 17)
Update July 2014: A more recent one is here: http://blog.mainstreethost.com/social-media-image-size-cheat-sheet (click to view full size):
[Link last checked July 2014]