The Ultimate Complete Final Social Media Sizing Cheat Sheet by LunaMetrics is a huge (and very long) informational infographic that shows the readers all of the important image sizing requirements for the major social networks.
I love that all of the sizes are shown in correctly proportional rectangles! Based on their claim, this infographic should also update correctly as they revise it to match the ongiong changes from all of the social networks.
Some color of the official logos of the different social media networks at each section break would have been helpful to the reader. The light typeface used at each section break is hard to distinguish from the rest of the design.
Found on Social Media and Social Good