Please forgive the intrusion, but I just want to point out a repeated grammatical mistake on this page:
Please note (especially if you're teaching English!)
Like advice and information, the word feedback is uncountable: it has no plural form and cannot take an indefinite article.
Olga: Do you expect any feedbacks? --> Do you expect any feedback?
Olga: I've noticed some teachers give feedbacks --> I've noticed some teachers give feedback.
Yvona: get a constructive feedback --> , get constructive feedback
Gabor: I usually leave a feedback on italki --> I usually leave feedback or I usually leave some feedback
Sorry for dropping by without adding to the discussion. I don't usually give unsolicited corrections, but I just couldn't let this one go.