Here are the filled gaps based on the provided text:
INBOX MESSAGES
Most people have too many emails in their inbox. You don't have hundreds of unopened or unanswered letters in your house, so why should you have hundreds of unopened or unanswered emails? If you can answer an email in less than two minutes, do it right away. If it will take longer, don't leave it in your inbox - move it into a 'work in progress' folder and reply later.
OLD SOFTWARE OR APPS
Uninstall software or apps that you don't use. This will free a lot more space on your hard drive or phone.
PHOTOS
You wouldn't put bad photos in a physical photo album, so don't keep bad photographs (or videos) on your phone - just delete them. Having poor-quality photos just makes it more difficult to find a good photo when you need one.
MUSIC AND MOVIES
One of the best things about digital media is that you have every song and movie at your fingertips. Unfortunately, one of the worst things about digital media is that you have every song and movie at your fingertips. Delete any music or movie files that you're never going to listen to or watch again.
FACEBOOK FRIENDS
Having too many friends on Facebook makes it more difficult to stay in touch with the ones you really care about. You can 'unfollow' Facebook friends without them knowing, so you won't hurt their feelings.
OLD CONTACT INFORMATION
Update contact information regularly and delete contacts you no longer need. Most people don't do this often enough.
PASSWORDS
Use a password manager app, like 1password. This gives you as many different passwords as you need and remembers them for you. You'll never forget a password again.
EMAIL MARKETING
If you get too many emails from companies and organizations, don't just delete them - unsubscribe. It should only take a few seconds. Just click on the 'unsubscribe' link at the bottom of the email.
EMAIL ACCOUNTS
Never have more than two email accounts (work and personal). For most people, one should be enough.
DESKTOP BACKGROUND OR WALLPAPER
Use a simple background or wallpaper for your screens. This will improve your productivity and attention span more than you think.
OLD DIGITAL DEVICES
If you've been using technology for any length of time, you probably have a small collection of devices that you no longer use - cameras, memory sticks, MP3 players, and mobiles. If you can't give them to somebody who would use them, dispose of old devices properly.