I first learned of Street-Complete here and I really like it.
It’s satisfying to walk around, complete little tasks, and get prizes, scratching a similar itch to Pokemon Go.
Stuck waiting for someone? Add opening hours for a few local businesses.
Have a long walk ahead of you? See if you can add/check house addresses as fast as you can walk.
Want to walk off a few beers before heading home? Complete some tasks in the bar street.
Its a very constructive way to “be right” on the internet.
Oh that sounds funny! Having a walk and doing something for the community.
Unfortunately it isn’t available for iOS. 🙁
There’s a web version, too. I haven’t played around with it much, but it looks like you can at least comment or mark resolved other people’s contributions
EDIT oh here’s a better comment re iOS: https://feddit.de/comment/11148500