I am going to employ the services of a graphic designer, to create logos/ images for my website for the following sites:Facebook (corporate page)Twitter  (twitter account for the business)YouTube  (youtube channel for the business)I can't seem to find a consensus view on what image sizes are required, or if I can use one image size for all three websites.Does anyone know the answer, or can someone point me to where I can find this information?
What is the standard image size(s) for facebook (corporate page), twitter and youTube?
website design;facebook;images;twitter;youtube
You can upload pretty much any size you want and the services will resize to suit (what they can resize to is listed below).Facebook: The max is 540px high by 180px wide.Twitter: Has 2 - 73x73 px and  48x48 px. You can also see the image full size by clicking on it in a users profile.Youtube: Is 88x88 px.editThanks to DisgruntledGoat for the comment, I have edited it with his additions.