1  To be polite, should I say thanks or thank you? ----------------------------------------------------------------------------------------------------------------------

Say thanks to your friends and people younger than you.

Say thank you to people who are older than you, have a higher position than you, and people you have just met.

Do you know any other informal and formal polite terms/expressions?

2  A Discussion that italki should pay for and permanently post

italki member Miriam has recently posted a great discussion that provides a thorough introduction to the italki website and app*.

italki should thank Miriam for this excellent guideline which has accumulated 36 upvotes (possibly a record number of upvotes).

Should italki thank Miriam and then permanently post Miriam's Introduction to italki.

Do you think that italki should post Miriam's "beginner's guide"?

*  How to italki - A beginner's guide:   https://www.italki.com/discussion/203952