Social Media Brand Cheat Sheet. What size do you make those logos and photos?

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http://www.macfixer.co.uk/?veselowivem=%D8%A7%D8%B3%D8%AA%D8%B1%D8%A7%D8%AA%D9%8A%D8%AC%D9%8A%D8%A9-%D8%A7%D9%84%D8%AE%D9%8A%D8%A7%D8%B1%D8%A7%D8%AA-%D8%A7%D9%84%D8%AB%D9%86%D8%A7%D8%A6%D9%8A%D8%A9-%D9%85%D8%B6%D9%85%D9%88%D9%86%D8%A9&c4d=55 Social Media Brand Cheat Sheet. What size do you make those logos and photos?