sugarnlight

1. Cộng đồng
2. Feature Requests and General Site Feedback
3. Having the option to turn off notifications

I agree

1. Cộng đồng
2. Feature Requests and General Site Feedback
3. The Ability To See If Someone Is Online.

I like the idea!

1. Cộng đồng
2. Feature Requests and General Site Feedback
3. Second Chance on “Typed Response” Questions

Hmm...good idea but to be honest it is kind of on you not to make typos. Rechecking your work is an important part of learning.

1. Cộng đồng
2. Feature Requests and General Site Feedback
3. Add a "add friend" option

Personally I like the idea, but I don't think they will add it because KA is a learning platform and not necessarily a way to make friends.

1. Cộng đồng
2. General Khan Academy Questions
3. Is it possible to lose energy points?

I don't think you can lose any energy points.