I never thought of it as "giving back," but I spend a couple of hours a week reading to a blind student at the community college I attend. It's hard to get Braille textbooks, so I just help him with his reading assignments.
What if birds sang with tiny human voices, but the only tunes they knew were "Shake It Off," "Let It Go," and "My Heart Will Go On?"
What if certain guys on this site would actually read my profile, and quit sending me their dick pics???