- 2013 Photo a Day Challenge
- 2014 Photo a Day Challenge
- 2015 Photo a Day Challenge
- 2017 Photo A Day Challenge
- 2018 Photo A Day Challenge
- 2019 Photo a Day Challenge
- 2020 Photo a Day Group Challenge
- Challenge Friday
- E-Cigarett E-Pipe e-Zigarette e-Pfeife Liquid Akku
- Flickr 888
- Flickr In The Real World - Instant Fave
- Flickr Monthly Scavenger Hunt
- Friday Photos
- GIMP users
- grandparents with grandchildren
- Hi Mom
- Mostly365
- OMG! Ubuntu! DESKTOP SCREENSHOTS!
- The Face of Health
- TuDiabetes.org