I have no idea about number 3, because I have not been exposed to that one. As for the rest they are all pretty common. They are more like a casual way of speaking among friends; close to slang, but not quite slang.

I don't think the breakdown is along ethnic lines as I have heard people of various races and ethnicities speak in this way. More than anything, I think it is regionally based. People from Texas don't speak like the people from New York, even though both groups are speaking English. People from Mississippi have a completely different way of expressing themselves than people from Southern California. So it all kind of depends. You also have to look at age groups. What you are describing sounds like a younger generation (teens to 30s) than someone closer to retirement age (65 ). 

So yes, you can say most of the things you described are pretty mainstream.

This is my first day of #moreфон2018. It's difficult to write in foreign language, especially you have never learned it before. I learned German at school. Last summer I took my first 6 english lessons. It was great, and I want more. When I have money for this I will continue.

I got up very early this morning,because my friends and I went to climb the mountain.
We arrived to Wu Tong Shan on time at 7:00AM.We almost spent about three hours to climb to the top of the mountain.
I was sweating so much. I was tired and thirsty but very happy.Actually, this year was my first time climbing in Shen Zhen.
Because most times I always stayed in the library on weekends.Mountain climbing is good for me.Then my brother usually just watch TV in his free time,he never do exercise,it's unbelievable. I guess he is a really real couch potato!

I got up very early this morning,because my friends and I went to climb the mountain.
We arrived to Wu Tong Shan on time at 7:00AM.We almost spent about three hours to climb to the top of the mountain.
I was sweating so much. I was tired and thirsty but very happy.Actually, this year was my first time climbing in Shen Zhen.
Because most times I always stayed in the library on weekends.Mountain climbing is good for me.Then my brother usually just watch TV in his free time,he never do exercise,it's unbelievable. I guess he is a really real couch potato!

I got up very early this morning,because my friends and I went to climb the mountain.
We arrived to Wu Tong Shan on time at 7:00AM.We almost spent about three hours to climb to the top of the mountain.
I was sweating so much. I was tired and thirsty but very happy.Actually, this year was my first time climbing in Shen Zhen.
Because most times I always stayed in the library on weekends.Mountain climbing is good for me.Then my brother usually just watch TV in his free time,he never do exercise,it's unbelievable. I guess he is a really real couch potato!