I think people need to learn about mental health.  Mental health is a level of psychological well-being
I completely agree. It's very important.
Cultural differences, subjective assessments, and other factors all effect how we see mental health
Yes I am sure in different cultures it is a taboo subject.
I was reading online,  According to the U.K. surgeon general (1999), mental health is the successful performance of mental function, resulting in productive activities, 
That's interesting.I think mental health is sometimes seen as silly.
I agree but from the perspective of positive psychology or holism, mental health may include an individual's ability to enjoy life