Anytime I can find a cheat sheet for just about anything online, I'm all in. It's already hard to update everything and keep up with everyone else... I don't have time to manipulate a background for twitter 58 times.
Here's a handy little cheat sheet for sizing your social media photos and such. Who would've though getting that profile picture the right size would make such a difference!?
Facebook, Pinterest, Google+ and Twitter... It's all here!
Also, you're welcome.