Facebook -----------
Facebook Profile: 800x800
Facebook Background: 828x315

Google+ -----------
Google+ Profile: 250x250
Google+ Background: 1080x608

Intragram -----------
Intragram Profile: 110x110

Twitter -----------
Twitter Profile: 400x400
Twitter Background: 1500x500

Youtube -----------
Youtube Profile: 800x800
Youtube Background 01: 2048x1152
Youtube Background 02: 2560x1140