Duolingo

How to verify

1. Add the text "6-9.space" to your social media bio / profile description.
2. For all networks except Facebook, add "6-9.space" anywhere in your bio.
3. For Facebook: add "6-9.space" to your workplace (preferably the last/most recent one).
4. Keep the text permanently — verification may need to be re-checked periodically, so it's best to leave it.