Chances are, your business is on at least one social media network. (If not, read how to decide which social media is right for your business.) These networks are outposts, or extensions, of your business and should be branded just like you would your own company website. Thankfully, most of the networks provide space for you to brand your social media account. The tricky part is figuring out the pixel size and image dimensions for each network, since they are all different!!
Well, look no further! Here we’ve created a cheat sheet with the image sizes for Twitter, Facebook, Google+ and LinkedIn.
Via Tocquigny, WildfireSocialMarketing