Here is very helpful infographic that guides you through the different Facebook image sizes as well as ad dimensions.
It is difficult and time consuming to keep up with the required and optimum sizes of images on the different social media networks, For example, do you know the correct size of the Timeline Cover Photo on Facebook; or the right upload size of a thumbnail link? Impossible to keep up with – and this is where this handy infographic from JonLoomer.com comes in handy.
Why is this important for social media marketing? The social media world and the Internet in general has become more visual. Facebook wants your images to be engaging and colourful – and this goes for other social networks like Google Plus and especially Pinterest. In marketing terms, the more interesting and visually attractive your images, the better the response from viewers and potential clients.