Because the size of the images on the most popular social media networks (Facebook, Twitter, Google+, and Pinterest) has been changed in the past few years, Lunametrics have done a complete social media sizing cheat sheet.

So all the dimensions for the images that you want to upload on your Facebook, Twitter, Google+, Pinterest, LinkedIn and YouTube accounts are in the Social Media Sizing Cheat Sheet Infographic below:

 

Source: LunaMetrics