What size image is best for which Social Media platform?

For Google+ the correct sizes are:
Profile banner 950 x 180
Profile image 250 x 250
Post image without black sidebars 3:4 ratio, with 800 x 600 should be minimum, better is 1600 x 1200 size

Worry no more as here they are: Save this!

#Jaanatip  
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