Is anyone able to use bonuses like the flirting and culture on Duolingo mobile? I'm not sure why it's not an option for me on mobile despite the fact that I bought it in the store on the computer.
The person who proposed Esperantomobile has called it his worst idea (or biggest failure, or similar.) Maybe it was just ahead of its time.
Ninjas are never ahead of their time. They arrive just when they mean to then fade into the night.
I was unable to use the bonus skills when I first bought them, but I'm not sure why, and I'm not sure how they started working. I may have finished them on PC before they started working on mobile, but I'm not certain. Sorry I can't be more helpful.