I made some social media/app icons Keynote shapes that you can use in your presentations or, since Keynote can export images, you can make yourself some quick, customizable, social media graphics.
After downloading the Keynote presentation, simply tap (or right-click) on a shape; from the resulting context menu, select add to shapes. Now, that shape will be available to use in all your Keynote presentations across all your Apple devices! 😁
Just click here to go to the download page.