For most folks, uploading photos to Twitter and Facebook is a "take what you get" proposition. But photographers are not most people. Photographers are notorious perfectionists, and so we like to ensure that our pictures will look their absolute best online and in print. So the folks at Lunametrics have come along and produced the ultimate cheat sheet for sizing pictures for social media. Simply download the giant infographic and resize your images as needed before uploading to a given service. Thanks to DP Review’s Connect blog for the heads up on this neat little tool.