You’ve probably noticed by now that Twitter has become more visual, now that images we post on Twitter are shown in the feed without having to click a link. You may have also noticed that the images are not as tall relative to their width as the typical horizontal (landscape) photo is and even if you post a landscape oriented photo, the top and bottom gets cut off. So, I have a couple suggestions.
First, don’t post vertical (portrait) photos and images unless there’s a really good reason because viewers will need to click the “Expand” link to see the whole image. Second, when you post landscape oriented photos and images, size them to 2 x 1 proportions. That means they are exactly twice as wide as they are tall. I like to use 1024 x 512 pixels because when someone clicks the image on the desktop they’ll see a larger version, but anything over 500 pixels wide should be okay.