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.

I created an iOS shortcut that lets you annotate a web page by opening the page with the https://via.hypothes.is/ prefix at the beginning of the URL. Hypothes.is does require you to sign up for an account, but it's completely free.