Sizes and dimensions for your social media graphics and photographs are important if you want to optimise your visual content marketing and streamline your visual content marketing workflow.
If you are managing your visual communications for your organisation, you probably will want to have the different image sizes for your social networks close to hand to help you optimise your visual marketing content.
Here is a helpful checklist from CloudTactix.
Another social media visual content marketing sizing checklist can be found here which also covers sizes for YouTube art work.
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