Across Facebook Wednesday profile pictures turned black as a protest over Tuesday's presidential election outcome. What is the history behind it.

When you buy through our links, Business Insider may earn an affiliate commission. Learn more A cover photo on a Facebook page allows users to customize their Facebook profiles with a personal image.

You can turn any of these stories into "Highlights," which will appear publicly on your profile page. Each highlight has a cover photo, and the default cover option is the first photo or video ...