Facebook can be a useful platform for keeping in touch with friends and family. However, it collects immense data on its users, even when they leave the site. Consider installing a browser add-on like Facebook Container in Firefox to hide your web browsing details from Facebook and prevent targeted ads and suggestions.

Most modern laptops and desktops have built-in cameras for video conferencing. Unfortunately, these utilities can be hijacked by malware that continuously spies on you, like the all-seeing telescreens from the novel “1984.” For peace of mind, affix a piece of tape to your webcam when not using it.